So much better for me than the 6% float cleats. I used those for a year and a half, and fought consistent knee pain for the last 6 months. New shoes (upgraded model of old shoes), and zero degree float, just like the racing days of my youth. Zero knee pain. Turns out at least for me, knee rotation around my proper orientation was hurting me. No longer!
I am an avid cyclist. I have a Cannondale Road bike with aggressive style frame. I thought these cleats would be good. As per my bike fitter, your body would react with some sort of float. These cleats proved not to. I normally sprint alot. With no float it will cause problems down the line. I recommend not for road bikes.
I have been using the crank bros zero degree float cleats for several years and I have found them to work very well.