I've got a AD50VT Vox and, peronally, I think it's the cat's ass. It burried everythign else even NEAR its price when compairing it so Marshall, Randall, Peavy, Fender, etc.
My friend has a fairly solid Marshall MG
Series 50 watt combo. The Vox eviscerated it instantly. I've got a meatier bottom end and a LOT more overall character to my tone. I have no need for a distortion pedal
One trick to the ADxxVT amps is NOT turning the gain all the way to 10. Back it off. And don't jsut scoop it all the way out either. 20% on the mids and 85% on the gain will clean up the tone a LOT. Max the volume, always. On the larger amps with the variable power, crank the master and set the power output to what you will use. This will ensure you're getting as much signal from the pre-amp to the "Valvereactor" section. The Valvereactor is the part with the tube.
In short, Valvereactor uses a small tube amp section run at low voltage to create much of the tube experience. The preamp signal is fed into the tube. The Tube's operation is varied depending on what amp model you select. It switches from A to AB to match the original amp that's being modeled. From there, it goes to a solid state power amp.
I spend most of my time on the "US High Gain" model (Soldano SLO-100, gain channel). I also play around a fair bit on the "UK Modern" (Mid/Late-'90s JCM) and "Numetal" (Dual Rectofier) models.
The amps modeled by the Vox are as follows:
BOUTIQUE CL - Dumble 100w head (clean channel)
BLACK 2x12 - Fender 'Blackface' Twin Reverb
TWEED 4x10 - 1959 Fender 4x10 Bassman
AC15 - Channel 2 of a 1962 Vox AC15
AC30TB - Vox AC30 'Top-boost'
UK ’70s - 1971 Marshall 50w Plexi head (high treble channel)
UK ’80s - 1983 100w Marshall JCM800 head
UK MODERN - Marshall JCM2000 DSL100, High-gain channel
NUMETAL - 1991 Mesa Boogie Dual Rectifier 100w head (High gain channel)
US HIGAIN - 1991 Soldano SLO100 head (Overdrive channel)
BOUTIQUE OD - Dumble Overdrive Special 100w head (overdrive channel)
For $360, I don't thin one could be too far off buying the AD50VT. The rest of the ADxxVT line is comparably nice. The 50 features, exclusively, a Celestion 12" speaker.
I enjoy the hell out of mine.