Its brilliant, the AVT range is arguably better than the JCM full valve range, esp considering the onboard effects. I used to have the AVT100 but used it via 4 by 12 cab and it sounded better than my JCM800 head through the cab. I now have a JCM2000 and only because of the use of a Yamamha SPX can I get a better sound than I used to with the AVT.
Basically AVTs can do no wrong in my mind :)

I miss that amp, the reverb on it is spot on! Ive tried so many pedals n racks trying to get reverb as good as I used to get on that amp but Ive never found it!

If I wasnt an amp snob Id probably use an AVT instead of the JCM