I bought a VT15 just before Christmas, replacing a DA20CL I used to have.
To be honest, I hadn't really used it much, except for an initial try-out, a couple of demos (using the headphone output - definitely NOT the way to get the true idea of what this amp can do!!) and testing new pickups at my workbench.
A lot of my work is as a theatre guitarist - I play in theatre orchestras for musicals, shows, etc. For this, it's very important to a lot of sound engineers to keep the noise level in the orchestra pit low and free from "spill-over". For many of these situations, the club / pub cranked combo approach is not feasible. A 15W small combo with a built-in power attenuator is ideal!
In the last few months, though, I've been playing more with a blues band in bars etc and have been using my Crate all-valve amp with pedals (Sort of a more 'traditional' bluesy set-up).
Today I had the first rehearsal for a new theatre show and brought out the VT15.
I was amazed! In that environment, this amp is far, far better than anything I've ever used - and I've used lots of amps in my time! I wound up setting it to the AC30 sound for everything (the songs in this show are rock hits from the 50s to the present) and it was brilliant.
I found the VT15 far, far more dynamically responsive than my Crate - and than the Carvin Legacy I used to play "Grease" a little while back. The tone was full yet clear at a low volume and blended beautifully with the other instruments. I could really hear a bigger difference on my Strat's different pickup positions than with any other amp, including the Fender Bassmans (a Custom Amp Shop model and an original 60's model) I've used in the past. And the ability to bring just a Strat, the amp and a guitar stand to the gig - and set up within 2 minutes - is worth a lot too! It even fits snugly inside a Rubbermaid tote so I can load the amp in (and out when he show finishes its run) without worrying about its safety. Perfect for this kind of gig.
The bottom line, mind, is tone. And this amp has SO much of it, such good, pure and strong T.O.N.E., that I'll find it hard to be satisfied with ANYTHING else now. The Crate Class 'A' Combo may be up for sale in the near future, to be replaced with a VT100. I can't justify having to replace and rebias EL84s when this VT amp doesn't need them and simply outperforms!
In fairness, there may well be situations (small club gigs, large club gigs, outdoor festivals, etc) where cranked valves are just what you want - no doubt it'll always be the way to go for some, especially for those whose minds are predispositioned that way. But I am quite simply BLOWN AWAY by the sound and usefulness of this little amp. I'm not exaggerating, either. And in my opinion, it puts even those much more expensive amps to shame in how well it functions - and sounds - under the orchestra pit conditions. Nothing else seems good enough anymore!