Originally Posted by TejanoTrackie

Basically, it's much easier to pull up on the pedals with clipless than clips, because you can pull back as well as up w/o pulling your foot off the pedal. As far as SPDs with walkable shoes, they are not quite as stiff as true cycling shoes, but for anything less than very long rides or competition they are quite adequate. I use DZR Minnas and Keen Commuter II Sandals with SPD cleats and have ridden up to 20 miles in them w/o any discomfort.