I recently bought a pair of the Shimano Ultegra SPD-SL model 6620. I was looking to go with the KEO's, but my LBS told me to try the new models as they were much easier to get in and out of. He was right. I found the old models hard to use. I have some Look A3.1 that I really like as well, but with Delta cleats being phase out, I figured it was time to move on.