My 2p worth, I was sceptical so i use these:
http://www.evanscycles.com/products/shimano/m324-spd-pedals-oe--ec050911
Best of both worlds, I much prefer SPD to flat, I was forever getting my foot into a bad position, now its fixed exactly where I need it, not so sure about the power thing on the upstroke, maybe thats just my bad technique
http://www.evanscycles.com/products/shimano/m324-spd-pedals-oe--ec050911
Best of both worlds, I much prefer SPD to flat, I was forever getting my foot into a bad position, now its fixed exactly where I need it, not so sure about the power thing on the upstroke, maybe thats just my bad technique