I dont really expect you are going to see much feedback because we have only sold 2 kits to Buick people. Dan McDonald installed one on a car (See thread
here for pictures) and one other guy bought one and last I heard from him was the car was at his mechanic getting the kit installed.
Except for those 2 sales, all the other sales have been to import guys. We have a dealer in New Mexico selling the crap out of the kits for the 3000GTs and some of the DSM guys have bought kits as well.
Brian Green bought one for his Syclone but I dont think he has done much testing yet.