How's it sound? Great! Definitely noticing it go through some phases as it breaks in, but nothing extreme. For a while I thought the low end sounded a bit bloated and tubey, but that seems to have gone away. Probabably coming up on about 20 hours now and it seems pretty stable. No listening fatigue at all. Highs are crisp and defined without being bright. Low end is now pretty solid. I need to reach around back and move the outputs to the Russian PIOs to see how they sound, but I don't want to turn things off while I'm listening.
For anybody thinking of building one, it is not very hard to make. Roy just gives you a stuffing diagram and wiring layout. He does not give you step by step instructions. But he has plenty of pictures of his builds so it is pretty easy to figure out.
I am blaming Roy for the lack of sleep I have had this week. Been staying up an extra few hours listening when I should have been going to bed.
I'm not totally happy with my wiring job across the front attenuators. It could have been neater.