I had some teething pains switching from SPD to CB but overall I like them now. You have to change the way you clip in, instead of just stepping on the pedal, you get better results sliding your foot forward or dragging your foot back. Once you do it enough it becomes natural but the amount of pressure to get in feels a little heavier, no big deal though. Another thing you watch out for is the tread on your shoe may require some dremmel love in order to allow the shell of the candy into the recessed slot of your shoe. The benefits are huge though when you start talking about the float. Once again I had teething because I had to turn foot out wider to get release but that went away after maybe ride 2 on the CB after 12 years of SPD. The float has two benefits for me, first is that it allows your foot to wiggle around which just feels more comfortable for spinning the cranks. Second benefit is that knee pain goes away even on really long days of primarily seat pedaling. Also any troubles you had clipping in during muddy days will go away. Oh yeah one more thing stiffer soles really make a difference on CB pedals cause there is less contact between pedal and shoe, it is pretty much all cleat.