Perfect with knee problems

It does not always have Shimano yes. These pedals of time allow the heel clearly continues to rotate without disengage. Thus, the leg can search biomechanically best way in the rotation. While I always suffer with Shimano SPD pedals with knee problems, these have disappeared with Time pedals immediately.
In addition, you can draw with the pedals without end.
Basically, the only downside is that the composite plastic scratched instantly. But the pedal is then relatively easy.
I sell my pedals, because I want to try it with platform.