I am currently very happy with my Speedplay Zeroes. I really like the infinitely adjustable float. I have one cranky knee and one happy knee and the Zeroes appear to be helping a lot. I've used Look-style pedals on my road bikes for 20 years, and I was using Shimano Ultegras when the knee issue first appeared. I tried the Keos and the knee issue was not helped. Moreover, I had a very hard time getting in and out of the Keos. I felt like the twisting to get out was a very bad thing for my knee.

At first, I was a bit distressed by how difficult it was to get into the Zeroes. However, I read on TE that I should lubricate the springs. I got a Teflon lubricant and religiously lubricated the cleats after every ride. As others have posted, the cleats become much, much easier to get in and out of after a break in period. After so many years of Look-style pedals, it's kind of cool to just stomp down on the pedal without having to to flip it. I do find that it does take almost full-weight to get into the pedals, but that doesn't bother me, now that I'm used to it.

Having said that, I have been told that some people think a Look-style platform is better for knee issues. Of course, others think the SP pedals are the way to go. I was lucky because DH has the Keos, so I didn't have to buy them in order to try them.

Alex