Yep, I do use Kleen Wheels. They work great. I've used them on cars since the mid-80s and had no brake related problems. I don't use them on the track though, because track use of brakes really heat up the rotors. Disadvantages are that you can't see the great BMW brakes. There are little slots that have a "turbo-effect" to draw in some air but I have them slightly hidden behind the wheel spokes. In normal driving, the brakes don't heat up enough to cause any damage. I wouldn't recommend them if you do a lot of hard braking from 100 in succession. I've seen 500+ degrees on the track. It sure beats constantly cleaning the wheels.