I tried both the A 530s and the 520s and I like the Time Atac Z pedal better than both of the other ones. I was getting hot foot from the 520s and the 530s were harder to get released from and they didn't swivel like they should. Maybe that would have loosen up in time, but I didn't want to wait and see if they did or not. I think the Time Z pedal has the biggest platform of any other pedal and it's really easy to get in and out of.