The general consensus from my friends who have played them is that they are ok but there are better cabs for less available. Most seem to prefer the Schroeder, Mesa, and Bergantino offerings in comparison.
I have the Berg NV212T and love it. Great sealed cab and probably my favorite cab I've played through. Definitely not the loudest though. The HDN's and NXT's are super pricy though and I'm after a 4ohm ported 212 that I can just leave at the space, has a little more output than the NV212, and take out on the occasional gig. Sweetwater has demo/used DG N212 for $829 which seems like a good deal. Sent me searching for reviews etc and didn't really find much. Still may give it go but also found a super clean Aguilar DB212 today as well for a little less $$ and no tax. My guess is the DG is maybe a bit more efficient but can't find the sensitivity ratings for them.
. FYI, its the Geddy Lee's Big Beautiful Book of Bass and its fantastic. Definitely a great read while stuck home during these crazy times.