The guy that designed and made the radius master booked a table at the Australian Knifemakers Guild show just after he started full time manufacture of the unit. He came around and asked a few makers to give him their opinions and we did.
We all basically said the same thing, great machine with some really cool features, flat grinding not a problem but hopeless for hollow grinding. OK for grinding to the right but the motor sticks out too far when grinding to the left. At first he was rather pissed off that we had canned his machine but later accepted our suggestion that a larger diameter wheel would solve the problem. As far as I know he has never made a model with the larger contact wheel.
I used the machine at a knifemaking demo I attended in Feb. this year and I still think the machine is excellent in all areas but hollow grinding. I reshaped several handles and guards on finished knives for some newbie makers and felt comfortable straight away. Its a good well made machine and worth the money if you don't do a lot of hollow grinding.
Peter