Ok, finished with day job stuff, dug into the amp a bit more. I always reserve judgement until I get it into a live gigging situation, but gawd knows I've cycled through enough gear to have a decent idea.
I'll compare it to the Mesa D800+ since...well, that's what it is sitting on top of. Running into the Subway 1-12 cab. When I first plugged it in it seemed a bit noisy but most of that was my Pigtronix Infinity (which needs to be rebooted regularly). Noise floor is similar to the D800+, it seemed louder on the Forte because I had it overall louder (master volume tapers are different).
My initial thought was that the Forte is a bit more open but more thin, but I'm finding this really depends on the gain setting and the VRC. I'm pretty much a compressor snob as I'm spoiled by using either my FEA dual band or Empress live and a Mike-E (Distressor circuit) in the studio. When I crank the VRC I find that I'm pulling up some distortion with my fretless, not so much on my fretted. The fretless though is an odd beast as the TI flats and low action combine for some interesting artifacts.
I typically leave the eq flat at first and mess with gain structures and in this case the VRC. Then I fiddle with the eq to see where they feel right/wrong. One reason I was interested in the Forte is that the eq centers are right around where I typically would set a parametric anyway.
I'll put some more hours on it tonight but I'm finding sweet spots by gain between 11-2pm and VRC 9-1pm. Once you get past noon on the VRC it is a bit too squashed for my taste, but frankly I like having a bit of it in the signal chain. Between those two knobs you can go from a more open/articulate sound to a fatter/thick tone. The G-string really speaks well on this amp, and in general notes seem to be very quick attack and they keep kicking. By contrast the Mesa is just a hair softer in the attack with just the slightest bit of sag (vaguely tubeish) - which I also like a lot depending on the gig.
With both amps I find I don't really need to touch the eq except maybe to deal with a room. On the Mesa you have the deep switch and voicing along with gain, the Forte it is gain and VRC. With the eq on the Forte I can get close to the Mesa deep switch, but not quite the same.
Short story is there is magic in both amps. The D800+ wins on flexibility as you've got the dual parametric, deep and bright switch, voicing control and variable HPF. But the Forte has the eq in the right places and the gain and VRC interact in ways that I haven't fully explored yet, but so far like. Both will get stupid loud.