I'm in the Time ATAC club. They rock. No complaints. Have never unclipped. Bash them into things they are okay. I ride them on the velodrome too. Though I don't skid often, when I have, they've been fine. I have the XS version, but the cheaper Alium's are pretty much the same I think. They're just a little heavier and don't have the futuristic alien spacecraft steez of the XS. They also have lots of float which you can change by switching the foot that the L and R cleats are on. + 3 different release tensions. They are my first clipless pedals, so I have nothing to compare them to, but I think they're great.

However, there's a good sale on blue-spindled egg-beaters... I don't know if it's over yet, but the price is right. I was considering it. Still am. You know, for one of the next 4 bikes I get.