I've been using Radian cutters for guitar making for over a year now and have been nothing short of blown away by the quality of the cut. This was highlighted when trimming end grain Wenge for a guitar headstock, just perfect, most standard cutters would have left the router screaming and with endless sanding to be done afterwards. With the radian bits, there's not even a suggestion of burning, chatter or tear out. The cut is vibration free and smooth as you like. Very impressive.
At this point I have, all of the 1/4" trimming bits, two or the 1/2" collet trim bits, three binding channel rebate cutters of various sizes and a chamfer bit. Fantastic stuff!
Tom Sands