i have some time aliums that i've not had a problem with yet... if you're going to run clipless though its probably just smart to run a brake too... foot skids are tough with cycling shoes on...

also those time pedals (z-something) with the platform/double sided entry might be a good idea too.. i've been thinking of switching up to those just because if you did clip out you'd at least have something to resist against that you wouldn't slip off of unclipped.


edit: noticed the speedplay recomendation... they wont pull out ever but theres no resistance on the float. i have some and opted for the times just because fishtailing on a skid made it easy for the speedplays to unclip pop out. I think they're definitely better for mtb.