I went to clipless because my feet kept slipping off the pedals and when that happened the came around and left nasty teeth marks on my shins. You are way more efficient at pedaling with the clipless pedals. I've also had my feet slip off on the platforms just as I need some power which made me go downhill backwards. Everyone told me you fall a few times before you get the hang of it and that is true. When I get to really technical sections I sometimes unclip but that is getting less and less common now that I am getting the hang of it. The day after I got my new pedals I rode a 14 mile trail, only fell over once and that was just forgetting I had them on when I stopped. Watch the mud build up in your cleats as that can make it hard to clip and unclip. It's the only way to fly.

--GU is people.