Crank brothers are way easier to clip out of, imho. I tried to switch over to time atac aliums after 5 years of riding crank brothers eggbeaters and candys. I gave it about a month, but I hated them.

Update 09/20/2010
So I picked up a pair of time atac xs pedals on a whim, and they are just as easy to get in and out of as the crank brothers pedals I've used. Maybe they are easier to use than the Aliums? Beats me, but they are now my pedal of choice, since they have a way better track record for reliability.