I had been using Looks for 22 years and just switched to Speedplay Zeros 2 months ago. I cannot believe I waited this long. I absolutely love these pedals! First of all, mounting them is a breeze because your for-aft, your left-right, and your rotation are 3 separate settings. You simply mount the base plates where you want them fore-aft, then you mount the cleat bodies where you want them left-right, and then the float takes care of the rotation. No more fiddling with oversized rectangular holes and washers trying to get the Look delta cleat "as close as possible" to where it should be. The double sided entry is great and I love the rotational float.
If you try them, get the coffee shop covers and then walking in them will be no problem. By the way, in case someone posts about how Speedplays are such "high maintenance", before each ride I give them a shot of Blaster Dry Lube ($4 at Home Depot) and it takes all of about...10 seconds. So the "you have to take care of them, blah, blah, blah" is a ridiculous argument, but inevitably finds it's way into these forums.
Try them. I will never go back.