I got a set of these and they look good. They give Superion a more bird-foot look, rather than the big ol' clodhoppers of the Perfect Effect kit.
Assembly did require quite a hard push to get the ball-and-socket joint to seat, and then I had to move it through the full range of motion a couple of times before it would move smoothly (probably this was the joint self-polishing, grinding all the rough spots against each other).
I haven't them since I'm using this kit with UW Superion, who has white feet. It's not a perfect match, but close enough!