i definatly think doubles are better on fixed gears if you are skidding and using alot of reverse pedal, as it spreads the pressure across a bigger area of your foot.

ive been riding with and without doubles for the last couple of days on my geared bike. i dont think doubles have as much use as you dont have the reverse pressure. however without bike shoes they do offer a more secure feeling than singles.

im gonna stick with my doubles, even on the roadbike. if i had shoes with cleats id probably just use singles.