I admit at first I was skeptical about this device. I installed it and kinda played around with the different setting and my skepticism was gone immediately. This controller really works and make a fascinating difference in performance. I have it in my 2013 Chevy Tahoe that I purchased in November 2019. I was disappointed at the acceleration/throttle response and immediately started looking for answers to fix the issue. I consulted my mechanic friends who were GM mechanics and they said it was an issue from day 1 with the trucks and suv line. They had no solution to my issue. I purchased the Hikeit-9 and I am loving driving my Tahoe. It made such a difference that my wife even noticed the performance was better. Shortly after I purchased the Tahoe she asked me what was wrong with it; "it has no get up and go". Now she asks to drive the Tahoe on a regular basis cause it is fun to drive. I had contemplated selling my Tahoe until I installed the programmer. We are considering getting a Hikeit for her Lexus. It truly makes a world of difference. Its easy to use and well worth the cost.