I used to run an acs claw, but i got throug them like there was no tomorow, my friends had the same problem, they got enos and i got a profile...well a few months on the enos are falling apart and one needs replacing and my profile is running great, and im no mechanic, its requires almost no sevicing and has never skipped, front freewheels have to take alot more abuse and therefore wont last as long, its worth spending the extra and gettin a profile that will last forever imo.