I don't doubt the quality of the Morizumi at all. It does look like a very nice, well engineered piece of machinery. I'm completely sure that if I used one in person I would be impressed.
I was mainly speaking from a work and convienence point of view. As mrrabbit said, all in one action, unless long threading. I probably cut more singles and doubles to replace broken spokes than I cut in an entire year for builds. The last set of wheels I built, were a personal set, and I had to come here for help. There just aren't that many people asking for custom wheels right now. The shop owner is far better at it and he does most of the builds anyway. So, with the Phil Wood machine on my bench, I just measure out and cut them in one motion and get on with the repair.
I can also second mrrabbits comments on powder coated spokes. They will gum up a P.W. spoke cutter fast.