The Ncore have left my home and headed back up to NYC for the next stop. I'll add my thanks to all of the others herein to Jason for his kindness and generosity in sending out these amps on tour. I enjoyed my time with them immensely and it was fun having Al, Kevin and Barry stop over on Saturday to give a listen.
I'll give a brief rundown of my system for reference. Oppo 971 transport into a JEC 7510 DAC with upgraded power supply, B&K CS 115 Preamp, which runs either passive or active, Pure AV power conditioner, used both in and out of circuit with the Ncores, VPI HW19Jr MkIII upgrades, classic NOS Empire cartridge, NAD 3020B as phono pre. Speakers used were slightly modded Maggie MMG's and PSB Alpha T, Yamaha twin 7" paper cone subwoofer. Cabling is a mix of Magnan, Zu, and Tuan's homemade cables, Zu Wylde were used with the Ncores. Comparison for the Ncores was a B&K ST202 amp, Barry had brought a Bell Canto that we didn't have time to hookup. The room is 10'x13.5' heavily treated with bass traps and wall mounted absorption. All of the components, except the Ncores, sit on Maple cubes.
I wish I had some startling new revelation to add to the previous reviews, but I'm afraid everyone has nailed the character of these amps already, and they weren't wrong. They come out and go back in the box with the same basic sound, no breaking in or warm up time that I noticed. Al had suggested Friday that I disconnect the amps from my power conditioner, even though it has a a dedicated high power outlet, and hook them directly up to the wall outlet. I noticed only a very slight difference, maybe opening up a bit, or not. Note that after the amps left I tried this with the B&K and noticed a marked difference, much more open and fast, closer to the Ncores than it had been previously. So despite the rather lightweight power supply, they appeared immune to variations in power source.
In comparison to the classic AB push pull B&K, the Ncores were immediately faster, cleaner, with a wonderful ability to delineate complex musical passages into their individual parts while still delivering a musically whole presentation. You could hear more into each instrument even with a reduction in apparent absolute treble levels. They sounded ever so slightly rolled off in the treble, yet had more high frequency detail, if that makes sense. Dynamics were completely unrestrained at loud levels, they never once pooped out no matter how loud we took them. Yet something I didn't get 'round to showing the other guys, they maintain this dynamic contrast even at low volumes. Bass, midrange, treble, soundstaging, imaging, tone, detail, etc. were boringly even and uneventfully excellent. They didn't do anything wrong across the board, there wasn't lightweight bass, harsh treble, flat imaging, haziness, nothing you could pick out to criticize. These are attributes I only hear in much more expensive amps, and certainly not in my B&K's.
One minor problem cropped up only when the other guys were here, the left channel Maggie went into a weird oscillation that sounded like a blown tweeter, but wasn't. The first trouble shooting was to switch out to the PSB's which fixed the problem and gave us a chance to hear woofer in boxes speakers, so we never went back. I have no idea what it was, it didn't crop up before or after.
I ran them with both passive and active circuits from the pre amp. I felt the active stage gave greater dynamics at almost no cost in noise or graininess. The passive stage was a little sweeter and cleaner, but I felt the trade-off went to the active side, which is the opposite of what I hear with my B&K. The other guys were firmly convinced I was wrong, and the passive stage was way better with only a slight loss in dynamics. A classic case of YMMV.
Here's a pic of the little rascals, sitting on some short speaker stands I dug out of the attic. Note they are without the custom front faceplates that Jason removed.

I can't wait for the $200 Chinese clones that will surely be out in a couple of months.