I'll be curious to see how the various Class D heads play with these Berg cabs. I'm sure they'll work very well with the smaller cabs, but I suspect the big boys (410 on up) will benefit from a more "traditional" power amp. Ya can't beat a Crest CA6/CA9 in my book, at least as far as dedicated power amps go.
Much as I wanted to check out the Class D's today, I just couldn't stop playing my amp rig (F1X->CA6) through that 610 with every Roscoe in the store. I swear when I plugged my personal fretless in, it was like "so THAT'S how Jaco got away with solo'ing the bridge pickup all those years". The tone was fat and yummy no matter what I did with my pickup blend.
Years ago (when I thought I was already in tone heaven) I made a tremendous tone leap when I switched from an Ampeg SVT-III-Pro head to the Alembic F1X and a Crest CA9 power amp. It wasn't like a 5% improvement, it was the proverbial "pulled the blanket off/pulled the cotton out" kinda transformation. All of a sudden, I had bottom with all of the notes on the neck. The upper register notes used to be thin and wimpy through the Ampeg, but they became warm and buttery through the Alembic/Crest setup. And I didn't change cabs in that time, it was the same GB 410 and GB 115 that I use today.
And just as a side note, I made that transformation in two steps. First I got the Alembic F1X. I'd tried it in the store (not my store, this was before I bought Rocket) through a Crest CA6 and the same GB cabs I use, and it was tonal nirvana. I got it home and tried it through some lightweight QSC piece of work, and I was beyond disappointed. I called my guy at the store, and he quickly hipped me to the fact that the QSC PA with the switching power supply was NOT in the same league as the Crest w/ the torroidal power supply. Sho' nuff, I got a Crest CA9 and the rest is history. I've since downgraded to a CA6 because I never got over "2" on the CA9...
Anyway, long post short - I seriously think this NV610 might just play out to be every bit as big a difference for my tone.
Of course, all of this only works for me because I'm still willing/able to schlep heavy stuff. And my monster rig doesn't scare the folks I play with

I don't for a second question anyone who says enough is enough, give me some small, lightweight gear that sounds good. I totally get that, I'm just not there yet... my back wants me to be there, but I'm not