comfortable

I've been looking into getting one of these shoes, but don't know which to get. I have been struggling with knee pain and have seen that these could both help. I don't know what size to get though. I wear a size 11US and have narrow and flat feet. I've seen that I should go up half a size, down...

Hi all - Any recommendations for a comfortable shoe with decent ventilatio? Head Revolt Pro? Any K-Swiss options??

In your opinion what is the name brand & model of the most awesome tennis shoes you've worn on the court. By awesome I mean the combination of comfort and performance.