2015 Colorado is a great truck overall.
Overall I love my truck but it does have issues that I can complain about. Overall the transmission is great. Sometimes, however, the transmission acts like it does not know what gear it wants to be in. It will either not shift as quickly as I think it should or it upshifts when it should have waited a few seconds longer. When the windows are up and I have the recirculate air button pushed there is a high pitched whistling noise that drives me nuts unless I turn the radio up to drown it out. The steering column has developed a nasty little squeak. Granted, the last two might be nitpicking since the vehicle is a couple years old. Things I do like.. The back seat has ample room for a 6'2" friend of mine. I like the space under the back seats. They also fold down so you can put things (or dogs) back there comfortably to transport them. The v6 engine has plenty of power. My truck definitely does not feel underpowered. I get 21 miles a gallon around town. The technology in it is great. I have USB ports, an auxiliary port, navigation, satellite radio, Pandora, access to the internet if I need it. A really great truck overall.