I too have the Pro Tools 'Racer' version ($180 now, but ask Keith for a discount, he's been flexible in the past). I've only done 15-16 cuts with it (all with the same hole saw, without the bit of course). The only problem I've had with it is recentering the bit after an off center cut. I finally used a couple scrap pieces of DOM to verify center.
I got mine from Keith off the 4x4Fabricators forum.
Pat