I have a MadCatz transparent blue Xbox controller (the original, large flavor!) and the only thing wrong with it is the A button is a little sticky. That is reasonable, though, because it's about 4 years old and, being a third party accessory, isn't expected to live that long anyway. Also, I brought it to a party and a kid who just got finished spilling his soda all over his hands used it, possibly helping/hurting the problem. Overall, though, a good controller.
I really like the original large Xbox controllers because they fit my hands better (I have large hands), don't give me pain after hours of playing and the Black and White buttons are much more conveniently placed (above the Y button).