It would be a rare person who has experience with both, but they might be out there. Certainly there are people who've played the Zephyr with different poweramps.Annybody know how the Zephyr combined with the Sumo1000 -Sound vs the BEAST?
One thing to keep in mind is that the Beast has, in addition to the gentle, switchable HPF on the front, a built-in, 24 dB/octave HPF set, I believe, at 30 Hz. The Zephyr does not, though I believe that Micah has said that he can build one in - you'd want to check with him, though.
You might also ask if building a power amp input into the Beast would be something he'd do (maybe before the HPF, to take advantage of that). I certainly can't speak for Micah there, though, and can think of a couple of reasons why the builder of an amp might not want to do that.
Who knows, though?