So much for all those hours spent on rollers at 120+ cadence, when what I really needed was to invent clipless pedals.

But that was 30 years ago, now I have SPDs on almost all my bikes. I like them for comfort, but certainly didn't see any significant efficiency gains when converting to clipless. That is, I couldn't ride any faster or farther with clipless, and they didn't improve my average speed by even 0.1 mph.