Started off with the Shimano SPL-SL, gave myself a couple of weeks to become more proficient clipping in by feel, but I still wasn't happy, given my riding conditions (daily commuting in NYC, frequent clip-in/clip-out, traffic scrum). I was much, much happier after changing to the SpeedPlays. FWIW, if my bike didn't do double duty as a commuter, I don't think that I would have changed from the SPD-SLs.