I just bought the GSX650F mi only complain are the mirrors install the two brother slip on and the power comander because i modify the air intake by drilling a lot of small holes with a drill so i could get better air intake because it was too restricted so i will get it mapped probably this weekend so i will let you know how many horse power did it gain i now that i gain a lot because know it accelerates a lot faster the seating position is comfortable and i think it looks okey i was doing 39 miles but probably beacause i haven´t finish the 1000 miles brake in so other than the mirrors and the muffler that weighted 14 lbs i didn´t have any problems with it i like the way it looks