Not sure if it had to do with the dac which it was hooked up to, (and obviously take all this with a grain of salt because meet conditions etc.) but I was genuinely unimpressed by the OOR + Hypsos combo at Canjam. I listened to it with a couple different things: my Mini (Custom headphone made by a start-up), a Utopia, and a few other ETA's (The startup in question). Overall, it sounded very reminiscent of two much cheaper amps: the JDS Atom, and Magni Heresy. In short, it sounded like a cheap op-amp implementation. Now, I'm not sure if that's how the amp is actually designed, but the sound overall was, despite being pretty clear and for the most part timbrally correct, very dull and unengaging. Transients lacked edge and slam, microdynamics were almost completely absent, and the music sounded, though not "off", as if it really lacked (to use a term Ferrum likes) "Soul". This is probably attributable to the fact that the amp just didn't seem to dig very deep, and smeared over the finer gradations of music (what many refer to as "texture" or "plankton"). I think it tries to get away from some of the characteristic problems with SS by having what is definitely a warm tonal bent, but this just ends up masking over some detail in the treble, I think. It also sounds pretty "Slow": not in a "rounded transients" sort of way, but more in the sense that individual notes were not particularly visceral or immediate sounding.
Overall, I'd expect this amp to cost somewhere from 300-500, not $3000 with the Hypsos power supply. The iFi amps, by contrast, (even the cheaper ones, like the Diablo and Gryphon) had much more character and engagement. Maybe it does better with planars, which I did not try it with. Or maybe this unit was a dud, or maybe the dac it was hooked up to just wasn't great. Or maybe my ears just don't jive with it for whatever reason. Anyways, a big disappointment for me, as an SS on the level of, say, an ECP DSHA-3F at an accessible price which can be easily purchased would be a great thing. But to my ears, it didn't come anywhere close to the 3F. No solid state amp I've heard does.