I bought one (AD60VT) in early 04. In Dec 04 it went bad on me while rehearsing. Vox fixed it, said it was a bad IC. The sound it was making when it went bad was it was very flat and warbly. I used the UK Blues setting most of all as this was the sound I liked. Anyway, after it was fixed I played it another month or so, the warranty expired, and then of course it broke again the exact same way. So, I bough something else. But, I've kept the AD60VT. It seems the bad flatting out/warbling problem is only with the UK Blues setting. I can get passable sounds out of the other amp models. Maybe the IC I wore out was only in the UK Blues signal chain or something.
Anyway, I would recommend NOT getting this amp. If you're like me, there are going to be 1 or 2 settings you like and you are going to use them 90+% of the time. Since that's the case, just get the real thing or facsimile with real tubes and stay away from this DSP crap. It's too smart for it's own good. I am not a Luddite, I swear. Just get a good basic tube amp and apply your own colors through your fingers, your guitar settings, effects. My humble .02, anyway.