Just wanted to update this thread on my results -

I ordered a pair of Time Control Z pedals first. They were as many people in this thread described - they took more force to clip out of then other clipless pedals I've used (including crank brothers), but unlike with the Crank Brothers pedals I can always feel exactly when I clip in or clip out which is really great. I found that with the Crank Brothers, I always had to overcompensate when clipping out to make sure I was actually clipped out, something I didn't have to do with the Control Z's, so it wasn't quite as big of a difference as you might think. The Control Z's also got a little easier to work with after initial break-in, but still required more force. I did prefer the feel of the Control Z's over the Crank Brothers personally, but the extra release tension was a little bit annoying and I wasn't sure I would want to recommend them to someone new to clipless, and I didn't know if it would be an issue with mountain biking where emergency clipouts are more frequent and more difficult.

I also needed pedals for my mountain bike, so I thought I would try one of their other pedals - Time ROC Atac Carbon's. I've been on about 3 road rides and 1 mountain bike ride with them. They definitely have less release tension than the Control Z's. They're at least as good if not better than the Crank Brother's pedals in release tension. They also retain that distinct "you've clipped in" or "you've clipped out" feeling that the Crank Brothers pedals don't have, so I would say overall they're undoubtedly easier. I believe they have a tension adjust so I could make it require more force to clip out if I wanted. It's my understanding (though I'm not 100% sure on it) that all modern Time pedals have this lower release tension, except the Control's, Control Z's, and Aliums. Look for the adjustable release tension.

For more details, scroll down to my comments in post #24 in this thread:
http://forums.mtbr.com/showthread.ph...29#post7022029