2011 Colorado 5.3 V8
Seems to work well. It is still a little early to be able to tell. Instalation was easy. I could tell a difference between the different types of tunes. The milage that I was getting on the highway was terrific to start with and I haven't had a chance to go on a road trip since changing the tune. Around town it is so hard to tell because of all the various conditions.
Purchased for a 1997 Chevy S-10, 4.3L with 32,000 miles. Only offers one tune level. Higher shift points are preset and can't be adjusted. Doesn't offer any monitoring functions, such as 0-60 time or engine conditions. I got spoiled with the SuperCh*ps programmers I had on my last two trucks. Unfortunately they did not go back to 1997 models.