After several years of using plain platform pedals, a friend has convinced me to re-try clipless pedals. I used to ride Shimano standard SPD-type pedals (the only ones I've ever tried). I liked that there was some side-to-side play on the pedals, but the rotational float wasn't enough for me on long rides. I have somewhat bad knees - I've had them looked at and there's nothing wrong with them - the orthopedist said it's just wear and tear helped along with a genetic predisposition for bad knees.

So, that being said, looking for something with good rotational AND lateral float (that lateral freedom helps a lot). If it has a cleat that doesn't grind on the ground when you walk, that's a big bonus. Also, since I don't have the funds for very good shoes, something with a bit of a platform might help. This has brought me to try to decide between Frogs and Time Zs. I've heard alot of good stuff about the Frogs being great for knees, but it doesn't sound like there's much lateral float, and the platform doesn't seem as big - bringing up hotspot concerns. Anyone have any opinions.