You need to know up front that this vehicle is not a really great trim nor exquisite interior. However, it is a workhorse. It will do anything for you that a pickup truck is supposed to do. If what you want is a very reliable truck without all of the glitter, and at a better price,this is the truck for you.
I should start by saying I have the 5.3 V8. It has more than adequate power. The payload exceeds the 2007 I previously owned. Because i have radical lug mud tires, my fuel mileage is only about 16MPG. I expect it will increase when i put street tires and quit hauling heavy loads or pulling a trailer. It has the trailer towing pkg, 4 wheel drive, and i believe it has been lifted, since i can't reach over the bed to access the bottom of my tool box. The BEST I have done is 20MPH but it is avging 16. i am running 275/75/18 tires. It also has the locking differential, a must on a 4x4. The trailer brakes are integrated into the dash, I love that. In fact the only thing it doesn't have is a telescoping steering wheel, but it does have adjustable depth pedals. It is as if I custom ordered the truck, I LOVE IT!!
I've driven plenty of trucks - F150, Chevy Avalanche, Silverado...but this one...this one blows them away! Looks amazing. Drives amazing. Technology is amazing. Comfort is amazing. Seriously, I can't say enough good things about this 2015 Sierra SLT Z71. I'm not one for fancy things, but I felt that I deserved a nice car - and this is definitely a nice care. Interior is well appointed with leather trim on the wheel and dashboard; nice wood and aluminum accents throughout the cockpit; user-friendly steering wheel and touchscreen controls; heated AND cooled seats; heated steering wheel for those cold mornings; power seats; and plenty of leg room in the back. Exterior is clean: 22" wheels help you ride a bit higher so you'll have better visibility; chrome accents are eye catching, but modestly appointed; overall...it just looks GOOOOOD. Ride is smooth and isn't "trucky" if that makes sense.
All in all its a great truck. The flaws that I seen so far are these, but not enough to sway you from not buying. Love the heated seats and auto start.
1.) Head lights Suck. 2.) Head rest feels like a brick. Probably so you don't fall asleep. lol. 3.) Needs more storage space like on top of the dash or center console style changed. The 3 sections behind the cup holders on the split seat styles are completely useless and waste of space. The dividers need to be either removable or gotten rid of. Would be a nice place for pens. Also the bottom center could pull out with a nice configuration there. Instead you have to lift the bench to get it opened. 4.) Ride is a little stiff, but that could be because its still new.