What's funny is that I have since sold both the 2:Ninety and the 2:100 and have kept the Velocity 300. And I'd amend that review to say it's fairly close to a 6l6 with the reactance on full, and an EL34 with the reactance dialed between 6-8, and the wooliness I experienced with the definition (presence) control seemed to have as much to do with the preamp/amp model and 4x12 cabinet I was running it through as it did the character of the power amp itself.
It came down to the fact that it's 1 rack space, 1/3 the weight, and zero tube maintenance and as "tubey" as I need it to be. Those heavy tube power amps required a separate 2u rack case to move them around since all of my gear in one rack case was just too heavy to move. I mean it was close to a separate 40lbs+ just for that poweramp/rackcase 2:90 or 2:100 combo!
In a band mix, it doesn't sound any less "tube-like" than a real tube amp. Compared to my friends' JCM 900, Orange Rockerverb, or 5150ii amps, my rig holds its own, and most of the time I think it sounds better! And more than once they've asked me "you sure there aren't any tubes in that thing?"