I use spd's but previous to my shimano ones, I used Onza's which had a lot of float in them. I used them for 8 years and it was only when I changed to the less float Shimano's that I found out how critical the Foot position is, in relation to the pedal. You can set the cleats up so that the foot will have a different angle on the pedal. It took a lot of adjustment to get this right, but when I had it right, My pedalling improved. The "Extra float on the onzas was masking the correct position that the Shimano's gave me (after a lot of settin Up)