I have had my auto tune for a couple days now from Rick at Amazon Tuning and i must say it is one of the better ones i have tried. The shifting is the highlight. Each gear is very firm and does not just slide into gear but shifts into gear. Everything is spot on and very smooth. Feels like stock around town but with firmer shifts and then just rips at WOT. Huge gains after 3500, 500-7000+ is very strong.