I have had speed play zeros for several years. I got them for Chirstmas one year because my step son had purchased them but didn't like them. I would not ride anything else at this point. Yes, they are a bear until you get used to them. Keep them lubed and clean. Lots of road grit gets in the bearings. I use a littler brush to clean the road snot out of pedals and the cleats.

About the knees; zeros have about 15 degrees of float which can be adjusted but that takes a little doing. My knees were really awful and I've had both replaced; one in 07 and the other in 08. I'm now a bionic bike rider and skiier. If you have any questions about that, I'd be glad to talk to you about it.

Stellar 1