I've used both and much prefer ATACs to Eggbeaters. The ease of clipping and unclipping coupled with a slightly larger platform (which is handy in cases where I can't get clipped in right away) make the Time pedals much better for me. That said the eggbeaters are nice and light, and clear mud well if that's an issue for you.

As far as not being able to unclip when you need to... it was never more of an issue for me with one over the other. You just kinda get used to getting out of them when you need to. I don't even think about it anymore..