I have tried various "clipless" SPD pedals and shoes and found they caused my feet to either go numb or cramp up after a few miles. Adjusting the cleats did not help and I also found that even the so called "recessed" SPD cleats still marked wooden floors and were not comfortable to walk in. On returning to flat pedals or toe clips and straps my foot problems stopped. However, if I use an SPD compatable shoe (minus cleat) with "normal pedals" I still have numbness and cramps. Having discussed the situation with a podiatrist, she confirmed that stiff soled shoes are not good for the feet as they prevent the feet from working naturally. The small area of the SPD cleat also can cause pressure points that agrivate the situation. I have flat pedals on one of my bikes and quills with toe clips and straps on the others and have had no more discomfort. Many people do not have any problems with the "Clipless" models so maybe it is just my feet! I had no difficulties clipping in or out of the SPD pedals, but they just did not suit me. I can also wear any old comfortable (and cheap) shoes which is a bonus. I sometimes think we are the victims of marketing hype and fashion gurus. I embrace all the developments in cycle technology; indexed gearing, carbon fibre, lightweight components etc. but feel, for leisure riding, clipless pedals are overkill.