I'm not trying to put down the superfly but, just wanted to share my experience and thoughts on it. I had bought the superfly when I first bought the Tormach because videos and reports indicated it was the best solution for a Tormach. I tried out a 2 inch lovejoy 4 insert facemill with octagonal inserts designed for cutting aluminum I thought I had previously lost. I was much happier with the cuts. It cuts smoother especially on deeper cuts and holds tighter tolerances on the depth. My main gripe with the superfly which is not exactly as surprise, is the hammering action of the interrupted cut. It can take some pretty impressive cuts, but it just sounds terrible and I'm not comfortable with all the vibration with the possible negative effect on spindle bearings. I still think the superfly is a great tool and can leave a better finish on a light pass, but if I find the facemill overall more useful for my purposes.