I'm interested in your observation about knee pain. My knees are on their last legs.....
after years of soccer during which my reputation rested more on being a "hard tackler" and tough defender than on ball handling magic. So, when it came time to buy pedals I did a lot of reading and went with Speedplays because they seemed most easy on the knees. I've not had a bit of knee pain on the bike.
Now, as I'm buying a new bike, it's been suggested that I ought to look at some other pedals that have less float, on the argument that using them will deliver more power. I'm not persuaded that I ought to do that. Anybody else have thots on knee pain as it relates to various types of pedals?