I got Speedplay LAs despite advice from the heavy hitters in the club. NO REGRETS!!! No knee or ankle problems. I always make sure I'm at the head of the pack at the lights because I HATE trying to get around all the others struggling to clip in in the middle of the intersection. Just follow mfgs directions on lubrication. No big deal.
OK, I've never tried any other clip-less pedal. But after seeing what I see at every intersection on every club ride, I ask myself, "Why bother?"
Do it. Pull the trigger.