My own experience is that I put a pair of the A530s on the hybrid that I bought a couple of years ago when I got back into cycling. Pretty soon after that I got my first pair of SPD shoes and started clipping in. I never used the platform side of those pedals after that. Ever. Now both my hybrid and my newer road bke have M520s, which are dual sided SPD pedals. I just can't imagine riding on a platform pedal now. The other thing that occurs to me is that with a dual platform pedal, one side flat and the other SPD, you're always having to fiddle with it on starting because the odds are 50-50 that it's on the wrong side for whichever shoe you happen to be wearing at the time. That can be really awkward, lead to slipping off the pedal, gashing your shin, etc.