Used GMC Sierra 2500 Denali for sale near Alpharetta, GA

Nice quality cars, the entire inventory is impressive and very extensive, and the customer service people were also very nice with their kind responses

One very awesome vehicle. Checks all the boxes you need in a truck and exceeds expectations on quality, performance, and looks great ,too. Love my nre truck.

Manny walked out of that office like a champion, looked me dead in the eye, gave me a straight answer, and got the job DONE. He talked real, worked fast, and didn’t try to upsell me on some garbage I didn’t need. He treated my ride with respect — like it was the xxxx Intercontinental Title on wheels. Customer service? THROUGH THE ROOF. Updates? On time, every time. Paperwork? Clean. Friendly? Like a rattlesnake with manners. So if you want honesty, hard work, and a man that knows what the xxxx he's talkin’ about, you go see Manny Platero. Because if you don’t… you’ll end up payin’ more money to some jabroni who doesn’t know a spark plug from a bottle opener

I love my 2021 GMC Denali 2500HD. I have gotten more complements on this truck than any other vehicle that I have owned. I get great highway fuel milage average 19-26mpg,which is great for a heavy duty truck!

I recently purchased a 2025 RAV4 XSE Hybrid from AutoNation Toyota Thornton Road, and I couldn?t be more pleased with the experience. Greco Gonz�lez provided exceptional service and guidance throughout the entire process. He was attentive, knowledgeable, and truly made me feel supported every step of the way. Greco took the time to understand what I was looking for and helped me navigate all the options with professionalism and patience. His transparency and clear communication made the experience smooth and stress-free. If you're looking for someone who genuinely cares about your needs and goes the extra mile, I highly recommend asking for Greco.

This truck is the truck that all others should look up to. It rides great, will tow a house, runs smooth, and gets great fuel economy. The Allison transmission is so smooth. The AT4 looks great too.

Because this is such a wonderful vehicle, I purchased it at the end of the lease. Dan and Russ were incredible in making this a seamless transition. My vehicle was inspected, rims repaired, appropriate services rendered, thoroughly cleaned plus received an excellent offer for new tires. I have been trading for many many years with Dan Ramsdell and his team. This experience is once again reason to make the John Thornton family of dealerships my only source for our family vehicles. Highly recommend this team now, just as I did three years ago. Thank you!!! The lease of my new 2020 Chevy Blazer was flawless. This was the third vehicle that I've leased from Dan Ramsdell. We have worked out the details on this transaction (all three) via email. I took limo from Atlanta airport to John Thornton Chevrolet, they opened at 8am just for me. All documents were ready, I only had to sign them and was our in thirty minutes. This gorgeous Black Blazer AWD 3LT has been detailed, filled up with gas, my all weather floor mats put in place and temporary license applied for tag with requested black license plate frame. Derek Strickland saw to it that everything was orchestrated perfectly and my transaction was seamless and most enjoyable. I will definitely trade with these professionals once again and highly recommend others to visit John Thornton Chevrolet!!

So far so good! This truck is the nicest truck I have ever driven. The stance, ride comfort and options are top notch. I went from a 2023 High Country that was having drive train issues but had all the creature comforts that you would expect in a top of the line truck. With the lack of confidence in that particular models 10 speed transmission issues, it became necessary to reestablish my confidence in my General Motors product.

Just had my 60,000 mi. Service and all went well! They also repaired a rain leak I found after the last storm. I?ve bought several autos from Jim Ellis and always have been pleased with sales and service . Ted and Harley in the Buick service dept .are the best!! I would recommend this dealer.

I paid over $106,000 for this truck with warranty. Do not care much about miles per gal. at that that price range. Just too much truck for me at my age.

Hennessy Cadillac is by far the best experience I have had ever in buying a vehicle. This is actually my second Cadillac I have purchased from them and I have nothing but great things to say! From the sales department to service it has been nothing short of amazing. I am not easily impressed but everyone I ever encounter at this dealership handles me with care and respect. Entering a dealership as a single woman could be intimidating but not here! Terrance and management went above and beyond to make sure I leave happy every time. I pay attention to how others are treated and I will say I haven’t seen anyone actually upset even in the service department. The concierge level service of greeting me opening doors all things I expect from Cadillac are given every single time. It is always neat and clean on the premises. And most importantly my deals are fair and respectful. Desmond is usually my service guy and he is absolutely always honest and makes sure I am kept up to date with any thing my truck needs without feeling pressured to buy or upsale anything to me. Even once sending someone to pick up a key for my truck when the other one didn’t work. I went to another dealer recently and found a truck I really liked and test drove that I could have purchased but didn’t because honestly I didn’t get the same concierge service from that Lexus dealership. Hennessy and Terrance made sure all my experiences were top tier. I have owned a lot of cars in my life and have had good and bad experiences on every level but Hennessy has not disappointed me one time. Check them out ask for Terrance in sales and Desmond in service and I promise you won’t be disappointed.

Love my GMC. Owned a Chevy and this absolutely beats it hands down. Never had any issues. Inside is very comfortable and can't imagine driving anything else

What a gorgeous truck, runs good, sounds good and has all of the amenities I need although I am looking forward to their next interior upgrade.

Everything has been good so far.. I love my new ride. Im Just waiting on tag, title, plate etc.. I'll give a full review after that..

Love everything about this Duramax Denali except the fuel mileage. 13-14 Mpg tops when not towing. Bought truck cause previous was stolen. Wish I still had my 6.2 High Country!

Recently purchased a SUV for daughter Baker and Keanen delivered the vehicle and completed all of the paperwork. The delivery was smooth and their dedication to us and the sales was commendable. I do highly recommend.

I've owned every other American truck and this is my first GMC. I bought the 2500 HD Texas Edition. I absolutely love this truck. It's everything I could have hoped for and more. It is able to pull my 30' travel trailer with no problems. So now when we go out with our trailer I'll have no worries. The look and feel of the truck is outstanding. The 6.6L gas engine actually gets great gas mileage. It gets about the same as my Ford f150 ecoboost. Probably better on the highway. Looking at about 13 miles in the city and 15 plus on the highway. Definitely got a better truck for the price compared to any other american models with the same characteristic and options.

It seems pertinent to share my point of view regarding them, saying that this a particular dealer has excellent customer service, a dedicated staff, and a fast system to serve you

This is the first diesel I have owned. The power is amazing and I really like the room inside the cab. This truck is a beast... Love it!

Great Service- Kenmanuel is best. This is the 2nd time ive worked with him in the last year & I couldnt be any happier!

Benjamin did a great job finding the car for me. He was very direct and helpful.

Great power and yet great economy. Love the safety features with the cameras and side vehicle warning. Camera that shows side of vehicle, including trailer when turn signal is on is great. Also appreciate the bed camera for hooking up gooseneck trailer.

Good experience buying a used truck. Kenmanuel was great to work with. Would buy here again

Kenmanuel do amazing job. Was very helpful. Love my new car. Thank you so much

About two weeks ago, I found a Lexus RC 350 at CarGurus and I stopped by for some window shopping and ran into Lou, who was helping another customer at the time. Even though the showroom was busy, He took the time to greet me and reassured me that someone would be with me shortly. That simple gesture really stood out and made me feel valued, even before I made a decision. After doing my research, I decided to return to ALM Marietta, and I'm so glad I did! I had the pleasure of working with Lou again, and I also had the chance to meet some fantastic folks in both the management and finance team.

Jesus Flores was a great and caring individual that helped me and my son with our purchase and made it so easy.

I love my Denali. Beautiful truck inside out. When I drive down the road all heads turn. I couldn't have made a better choice. That's Cortez for you good service.

Damien Brown was super helpful on the phone and even more so in person. This dealership has a huge inventory and he was very knowledgeable about all of the different cars available. There were no pushy sales tactics, and I never felt pressured. I would absolutely seek him out again if I were in the market to buy another vehicle.

The service is good. You will find what you need and what you want with them.

Truck was bought specifically to our travel trailer. We have to wait for 1000 break in before we can tow the trailer. So far the truck is very quiet, smooth running, & comfortable to drive. We were pleasantly surprised at how much interior storage space is available. Having the bed steps before rear tires and in the bumper sides is very nice. Bed rails are even with my shoulders so the steps get used a lot.

As a proud Cuban woman who values honesty, respect, and family-like service, I have to say—working with Manny Platero was an absolute pleasure. From the moment I arrived at Rick Hendrick Chevrolet of Buford, he treated me not just like a customer, but like family. Let me tell you, sometimes as a Latina, especially with a bit of an accent, you worry you won’t be taken seriously or that people will try to take advantage. But not with Manny. He listened to me carefully, explained everything clearly (even the things I didn’t understand about the car), and most importantly—he made me feel respected. What I appreciated most was his patience and the way he took the time to walk me through each service step. He wasn’t trying to push unnecessary work or confuse me with technical words. He was genuine, kind, and very professional. It reminded me of how we take care of people back home—with warmth, but also with integrity. Gracias, Manny, for making this Cuban woman feel seen, heard, and well taken care of. You’ve earned a customer for life—and I’ll be sending my whole family your way. Con cariño, María G.

Blake is a top notch service rep and is extremely courteous and respectful of his clients time. They work quick and efficiently. You can rest assured your vehicle will be repaired quickly and correctly when you work with Blake and his techs.