i tried that once (clipless -> clips), also ended up going back. i've got big feet (size 13), so I ordered some X-Large MKS clips, but they just didn't do it for me. yeah it was conveinient, and after some practice it was easy to clip in, but I missed the feeling of really being anchored to the pedals. now if crank bros. just made a pedal akin to the shimano M324 (with a platform on one side), i'd be oh so happy.....