I have shaken one cheep aqua terra rep to bit on the harley on a run to UK a few years ago but apart from that the rest have been good.
I have used reps for just about every thing, biking, swimming, sailing, climbing and one of the hardest on them all drinking. Today i was out running for a few kms wearing a loose (it was about 3 degC and i was just wearing a t shirt so imagine how thin my wrist were compared to useual) EX2 from silix, the same one that with stood the steam room the other week, it was getting a right shaking as i dragged my ass round the test, still working, just think though the stresses you give you watch just giving the old teath a good scrub for those of us that still have them