I switched from Looks to Speedplays. No issues. I started with X-series pedals, and ultimately moved to Zeros because I wanted a little less float and some control over the amount of float. The downside to Zeros is that they take a fair amount of force, especially when the cleats are new. Light Actions are a good compromise for a lot of people- a little less float the Xs (same amount as Zeros), but a lighter spring and therefore less force.

http://www.speedplay.com/index.cfm?f...re.compareroad