I've been using those kovers since February and they're great. My cleats look brand new (except for the part that actually clips on.) which is nice... they also retain the screws if the screws back out, which happened to me a few months ago.

The real benefit is the traction on any kind of ground. I think I paid $17 from his website directly, which seems kind of spendy to protect a $40 cleat, but I'm quite happy with how they work and how effective they are. Put one foot down without worry of slipping and walking up stairs is much easier.

I have cafe covers... somewhere, I lost 'em. Of course that's the point, the keep on kovers are always on.