I come away with the impression that Mike Silverton considers them competent amps, and he specifically writes the H20 is "a contender".
While he comments favorably on the H20's ability to recreate strings, lower midrange and bass, he makes no mention of upper midrange, treble, or vocal reproduction.
Finally, Mr. Silverton admits he is not a fan of tubed electronics, and yet he finds himself suggesting that the H20 amps would be a good alternative for those who like tube amps. Huh? Isn't that akin to a vanilla ice cream lover recommending a brand of chocolate ice cream?
Within the context of its bronze-amber character, the M250SA performed well: dynamic gradation, soundfield veracity, textural depth -- its a contender. In an early phone conversation with Henry Ho I mentioned that Ive never been a fan of tubed audio components...In light of that conversation, I find myself in the curious position of suggesting that audiophiles with a taste for tubed electronics -- in particular for a luxuriant midrange and rich, full bass -- will find H2Os top-of-the-line mono amp an unusually attractive, maintenance-free alternative, with, as a bonus, a superior command of musics nether strata.