For a round trip of 28 miles, I'm using Wellgo/SPD cleats and Coda pedals. I can definitely feel the efficiency difference from using clipless pedals. I guess I ended up using this system because a) I prefer shoes that are easy to walk in, and b) the the Wellgo/SPDs are the least expensive pedals and cleats for use with those shoes. The Codas were an ebay purchase that just happen to fit the cleats I already had.