also got an AD30VT - pretty pleased with it.
I dont use the effects on the amp, purely cos i have better effects from boxes / rack units etc, but ive played with them and they are pretty good for a built in effects job.
I mostly use the AC30 / or the Fender sims
I think the AD50VT has a few more inputs and an effects return input, so if thats a requirement then you have to get the AD50 or AD100 - just check the specs on each before you buy.