After using flat pedals for about five years, the SPD SL pedals scare me a lot. It takes a few not to loose it when you missed the clip side of the pedal. But other than that I go faster now with a bit of breath still left in my lungs. Walking with these shoes is a problem though. In long rides I will be carrying a pair of snickers in my back pack for walking around, e.g. boarding a ferry.