I guess I'm the strange one here. I rode for 2 seasons with Speedplay Zero and was convinced when I had a bike fit to go the other way. I went to a set of Shimano's. I think it is easier to clip into the Shimano's and I also feel I get a more stable feel out of the Shimano's. I don't wear cycling shoes for walkability, but I think the Shimano cleats are easier to walk around with as well. I didn't have any problems with the Speedplays but I do prefer the Shimano pedals.

The reason my fitter gave for me to change out cleats was stability. I have a very wide foot and wear Size 50 shoes. He said there just wasn't enough base there to support my foot and I was rolling outward on my pedal stroke and was losing efficiency.

I'm not looking to flame anyone. Just putting it out there.