That's funny, I read about a guy with Apogee speakers that had the H20 amps and the NuForce Reference 8 (early version), and he said it powered his Apogees just fine. And I believe they were the very low impedance model. He summed up that experience by saying that the H20's had more ultimate bass weight and slam, but other than that he thought the amps were very comparable. I know the Ref 9s have more bass weight and slam than the Ref 8s, so I guess that would even things up a bit more.
Hey, I'm sure they're both great sounding amps, and that one may do something a little better than the other (and vice-versa). To me it's not that big a deal. I just think it's silly to say (or to believe) that one amp is hugely better.
I have about three reviews to write at the moment, but perhaps when I'm further along I'll contact Henry Ho to see if he'll send a review sample.
Meanwhile, if there are any H20 owners within driving distance of Tucson that would like to do a shootout, let's get it on. ;-D