I been doing some heavy research on the Time pedals and I am real close to pulling the trigger on some of the ATAC's. Currently I am only running some Shimano SPD PD-M520's and they have given me no hassles in 2+ years and are only $35 on ebay brand new. I have used Look A3.1's and Look Keo's and liked them, but I decided I wanted to be able to walk around if I needed to and moved back to mtb pedals. The reason for moving to the ATAC's is that they have a slightly larger base for my foot than the Shimano's.