I am one of those using platforms with the pins. Tried clipless, and was doing OK unclipping the left foot. Went to stop at an intersection, but the road had a dip which threw me off to the right-so....... Just never really got used to them or the feeling of not having my foot free on the pedal. Being clipped in just wasn't for me, no matter how many times I tried it. But what little efficiency I've lost can't make much difference as I haven't been riding much anyway! Didn't ride much last season at all, for one reason or another. Hoping for a better season this year.