i've always used SRAM chains on my bike..i'm currently using the PC-91 (the one w/ the holes in the plates) and i've never had to think about it once it was installed. although, i have seen the powerlink breaking on guys that ride really hard (freerider/dh kinda riding).

I'm curious about the shimano chains though...i keep hearing that they work a lot better because they are made for the shimano parts..anyone try both out and notice a difference?