They're quite a bit lighter than Time. Honestly, I don't care about this but one of the shop guys was weighing them. There are some other reasons one of the guys I talked to a couple weeks ago didn't like time but I can't remember them now. He seemed to like look, egg beaters and the newer spd pedals better, and since I trust him I just wrote off Time.

As far as the look vs. crank bros. goes... It's kind of hard to explain without having both pedals in front of you. If you look at the engagement between the pedal and cleat the look pedal is much more positive. The bottom of the wires that engage with the cleat on the eggbeaters are angled so it is possible to pull out of them if you pull up hard enough, like while skidding or grinding up a hill. The engagement on the look is parallel to the sole of your shoe so this doesn't happen. If you pull up on the cleat is doesn't want to open the pedal. (See my crappy paint drawing.) Look also sends their pedals with a bunch of shims so you can adjust where your shoe hits the pedal body. That way when you're mashing there isn't any slop between your shoe and pedal.