I've been riding on Keywin CRMs for a couple of years and they are excellent pedals. They are a very comfortable pedal to use. The cleat is really large and I have never suffered from hot-foot like I used to with the LOOK pedals I used to ride on.

You do have to maintain them, replacing parts as they wear or you will eventually get breakages. Apart from the spindle, screws and bearings, all the rest of the pedals and cleats are manufactured from nylon composite and these parts wear with use.

Float is the amount of lateral rotation the pedal allows before beginning to disengage. It's a whole religious discussion about whether float is good or bad for both your knees and your pedalling efficiency.