I bought one of Ken's annealing machines a year or so ago, and have used it on all of my BR, Dasher, 6x47, & 308 match brass. There are a couple of things that make me wish I'd have waited and bought a different machine.
One, the only way to adjust how much heat you apply is by adjusting the position of the torches & the individual torch valves. A couple of the other machines have an adjustable dwell time feature.
Two, it gets expensive buying different wheels for different headsize cases. I shoot 223, 6 RAT, 6BR&Dasher, 6&6.5x47, 6.5x55AI, 284, & 308. I bought my machine with the reg. & short #22 wheels, but still need three more wheels to cover the 223, 6 RAT, & 284.