Again, I apologize for not having sound clips yet. I am working on it! I used the VHT Special 6 with a JJ 6v6 and JAN 5751 at rehearsal for the Mark Cameron Band last night. With this rock group, it is all about dirty harmonica tone. The band uses a full set of monitors when rehearsing and things can get sorta loud. The guitar was going through a Marshall 2x12 combo (but was at a totally appropriate volume). The bass and drums were full rigs and in the room we are in, it gets loud.
I was sitting right next to the bass player. The VHT was several feet away and turned at me. I had no feedback problems with the amp cranked. I had no hearing issues when comping or playing anything laid back. When I had to solo over the band's full volume, I did start to lose the amp in the mix. I could hear myself, but not as well as I would have wanted. A quick fix would have been having the amp closer to me or running it through my monitor. All-in-all, I think it would work for stage volume anywhere a full-sized harp amp isn't needed. Obvioiusly, it needs to be miked front of house, but I think it could keep up with an amp like a Pro Jr, Super Champ XD, or the like.
The true test will be on stage with this group. If there isn't a separate monitor mix on stage for me, I think I could still get by in a lot of places with the amp on a stand. In a huge room, such as the Blues Saloon, I'd just use the HG50.