This is a new model that Demeter first displayed at NAMM back in Jan. 2017, where I played through it and loved it. (there it was shown in a flip-top combo version with a 112 cab, but the tolex covered head-only version is what I have, as seen in the product photo). The amp is currently marketed only in Japan, but James will make them to order for US customers, as he did in my case. It took about 2 weeks between placing the order and receiving the amp.
At the direct price of $1199 I think the Bass 800D is very reasonably priced for what you get.
Because I've been using a Demeter Minnie 800D for the last couple of years, and a VTBP-201 on and off for many years, I had a baseline expectation that the Bass 800D would sound good. However, my jaw just about hit the floor when I plugged into it, and I was immediately seduced by the massive, beautiful, fat yet controllable low end courtesy of the inductive bass boost circuit (a feature that makes its debut on the Bass 800D). In addition, this amp offers something else that I almost didn't realize I'd been missing lately - high end! Especially with the mode switch in the bright position, the 800D has very present but not overly aggressive highs and upper mids, voiced in exactly in the right range to bring out nuances that I haven't heard adequately through my live rig for quite some time. The balanced DI output sounds amazing as well, probably the best I've ever heard and the recipient of some glowing comments from front of house engineers.
I've used the Bass 800D on a few live gigs now, and I've liked it more each time (the amp, but not necessarily all the gigs). It has more than adequate power (rated 800w @4 ohms) - the power hungry cabs that I've used it with so far (a 4 ohm EA VL-210 and an 8 ohm Bill Jenkins 112) definitely put it to the test and I wasn't disappointed. Like the Minnie 800D, the Bass 800D has a considerable feeling of heft and headroom, unlike some class D amps that give you the sensation that you're hitting a soft, saggy ceiling when you crank them up.
The basses that I've used with the amp so far are a Moollon J-Classic V (as seen in the photo), a Fender Roscoe Beck V and a Warmoth/Fender P-bass with flatwounds. All sounded amazing, with their individual personalities coming through very nicely.
I look forward to putting this amp to work in a big way in the slew of gigs I have over the coming months and, needless to say, I'm giving it ten thumbs up.