I dont know if i can help. I have the LC30, which is a very different amp but is great for petrucci. I can say that laney have awesome build quality although i havent compared them to something like boogie.
Last time i heard a*VC50 was on an italian tv show called Roxy Bar were bands play live. The guitarist had a VC50/100 [not sure] tru which he played a Tom Anderson droptop. He wasn't playing Vai but he sure as hell had the best tone i ever ever EVER heard!!! :biggrin:
Go and try one...you'll like it. If u cant, rest at ease.
It's got six gain stages if i remember well.