I have it and have used it a little. I should be using it alot this weekend and will post more later. So far I like it. I makes polishing metal go much faster.
I bit the bullet and tried it on my Team III's. It seems a bit large for my application, but does a nice job, especially on the inner rim. The problem I have is keeping the Powerball away from the "as cast" centers when I do the outside of the wheel. Got to be extra careful or I end up with black Powerball "schmear" on the centers.
Overall, a nice product for $10...but overpriced at $29.
I also highly recommend applying the polish to the wheel surface and not the Powerball....way too much sling.