Well, being someone who owned one, and sold it, I have opinions on this...
The Blue Voodoo was out for about a year before Marty started using them.. Having one of the first ones myself(back when street price was $800) , and hearing him play, I'd say he used a different preamp w/ the BV's power section..
IMO The amp is *very* low-mid heavy, good if you like that, horrible if you don't.. I almost stopped playing altogether when I had this amp, I thought that if I couldn't sound good through a 'tube' amp, I must suck.. I tried everything, eq's, distortion pedals, different cabs, nothing made it sound right to me.. The clean channel is nice, but who wants to pay $800 for an amp, just to run a metalzone through it?
Play the he&#0124;&#0124; out of it in the store, every type of music you can think of.. This is the only way to tell if you'll like it.. I'd say it would be good for just playing hard rock, but definitely not for thrash, it's all in those low-mids..
Never had one problem with it working, or breaking down, but I just couldn't stand the way it sounded..
If you like the tone, I say go for it, they're a lot cheaper $$-wise than they used to be..
If you wanna sound like Marty, get a Hafler Triple Giant (the one designed by Bogner), and a VHT power amp... That's the closest tone-wise I've heard to his sound..