I've enjoyed my pro cal tune. Definitely faster. My QM time is down to 12.7... Maybe it is the cooler temperatures, but I am getting 0.3 secs faster since I've pt in the tune. I did it myself. I am not sure why people on here are getting dealers to do it. All it is just loading 1s and 0s. Yeah, I get that 6th gear thump, but easing a little gas when shifting mitigates the issue all together. Overall I would rate the tune a B+. Not bad at all.