So I stopped by Decware on my way home from Peoria yesterday. Spent some time chatting with Steve, and gave a bit of a listen.
Steve was working on a JR. I really like the symmetry here.

And while we spoke, I heard good music coming from the other room. Nice, room filling music.

After a while, I sat down and Steve queued up some tapes. Which sounded good as always

So, I'm sure you're all wondering what I thought.

I have to preface this by saying the amp isn't done yet. Steve is letting it simmer - just using it, and seeing what happens, how he feels about it over time. He admits, that over time, the monos are really sinking teeth into him.
Also keep in mind, Steve builds these prototypes with "common parts" I'd call them. So this doesn't have UFO transformers, it doesn't have the choice caps, and I'm sure there are other little details that a production amp would have that a prototype wouldn't. Steve's thinking here is that if he can squeeze the best sound possible by really working the circuit, till it can go no further; then the UFO transformers and best Jupiter caps and even better layout would only elevate the amp.
Ok, so first things first. As Steve mentioned, the amp is just into the low 20 watts on an 8 ohm speaker. He has it playing through his white HR-1. And flat out, it does not sound like a little SET amp. It was big, and room filling, and had BIG bass. And this was at a casual listening level that you had to raise your voice to be heard over. (We also eventually moved to the Monolith speakers)
As the listening progressed, he kept turning the dials up a little here and there (with me following behind and by ear adjusting the left/right levels!). We listened to several tapes, from modern blues, to Hendrix, to Madonna.
I found absolutely nothing wrong with the amps. But I also didn't hear a ZMA killer.
I told Steve this flat out. That's when he reminded me that it doesn't yet have the UFO or Jupiter caps and whatever else. Plus he pointed out the amps honesty. As we went from tape to tape, the true nature of each recording came through. No, I'm not talking super-micro-resolution or absolute transparency - just an honest reproduction of what it was given. Basically, this amp (to me) some of the ZMA's "just turn it on and don't worry about it" reliability of what was going to come out. This makes sense, because like I said...I found absolutely *nothing* wrong with these amps. I didn't feel like they were running out of steam, I didn't feel like they were lacking bass, or blurring mids, or damping high end...they just *were*. I also noticed that they didn't sound like Zen amp. Or a typical Decware amp in general. You know how everything from the Zen to the Rachel to the Torii has some of the same DNA in them; they are Decware amps at heart. I didn't hear that lineage with the monos - the tube and the circuit are different enough, that they are far off cousins. They do everything you expect from a Decware amp, but they don't have the core sound. But they also aren't weird aliens from planet OTL either!
I told Steve - that to me, these amps need to keep everything he's got going on right now: the big (not boomie) bass, the SET sound that doesn't run out of steam, and the honesty that I absolutely hear in this amp....but he needs to have that transparency and resolution of the Zen amp. To this Steve nodded sagely, and turned to me with his impish grin and said "you'll have to come back in another month or so and give it another listen - we'll see if the circuit stays the same"
So there it is right now - IMHO, it's not a ZMA killer, but it's something special and right up there at the ZMA caliber. I really hope Steve has (at least) UFO transformers dropped in the next time I stop by. If that pulls that last bit of resolution that I was hoping to hear...DONE!