I can't answer for SK - only myself

I ride spd's generally, but have one pair that are flat on one side for store runs, etc. I have apparently trained myself to pedal circles. When I pull up and I'm not clipped in, foot flies off of pedal - the other foot is still pushing down, so the crank is still rotating, and all of a sudden I have a large pedal gash in my shin

I don't know if I'd have the same problem with cages/power grips. I'm happy enough with clipless I haven't felt the need to try them out. To each her own...