So here's the report: this cab improves the tone of my DG30 by about ten zillion percent.
According to my sources, that's a whole lot.
It's a very sweet sounding cab, even with new V-30s, something I attribute to both the design of the cab with the twin ports, and the fact that it's solid pine instead of birch ply.
The second piece of news I have to report is that as soon as I took it out of the box, I put a nice ding on the bottom near the front edge carrying it down the stairs to my studio. Was I ever pissed at myself!