I haven't. One thing I have noticed is that sometimes, in my hsste, I don't get a full and complete shift and I'll hear extra noise as I'm pedaling. I can shift a gear up or a gear down and then return to the gear I really wanted. Or, a more elegant solution was put forth by BarnBoy in his Hydra thread. Just put pressure on the shifter to "come up against" a gear change but not actually shift. That causes better gear engagement.