I bought the stage 1 tune ECU and Transmission tune. I have yet to do the transmission tune due to a compatibility issue. With that being said, I was completely caught off-guard by the quality of tune stage 1 is. After the flash I took my 2008 audi tt FSI 2.0 for a 20 minute test run. The difference in acceleration and "pull" my car has now is noticeably better. I can't emphasize this enough. 2knd gear was the most noticeable, but overall my car is considerably faster. The price is obviously a factor but if you want to maximize your cars HP Unitronic has got you covered. I currently have the cold air intake and flash done, my catback comes Sunday. Now I am even more stoked to get the exhaust in because it should benefit a bit more overall. No check engine light, minor hiccup due to outdated factory firmware on the EVU but was solved in 2 minutes with a phonecall.Thanks Unitronic, forever a customer now for all my tuning needs