In my mottly bike collection, I've got a 2004 Fox TALAS, coil sprung Revs with motion control, brand new Dual Air Revs with black box damping, Fox Vanilla RLCs, oh, and some new Floats. (err..and until recently some DT Swiss XMC130's).
TBH, the only one's that I've had problems with were the DT's. The Fox's have been fine, even though the TALAS's went over 4 years without a service (ahem). Performance wise, I think the Rockshox motion control damping is probably the least refined feeling of all the forks – the standard Fox damping is definately better at fast repeated hits. The black box damping on the new Revs is probably the best of the lot, although I've found the dual air takes a bit of faffing to get it feeling just right – despite all the hype it ain't as good as a coil spring.
Wouldn't worry about the reliability of either Fox or Rockshox, both seem way better than the other makes.