The Greenback is supposed to be ideally suited to blues style. I have one in my 1x12 and I like it a lot for jazz to classic rock type tones, but my experiences with them in is that they get kind of fuzzy sounding in high gain settings and might not be agressive enough for metal styes. I found the Vintage 30 to be a bit too gritty/edgy sounding for my tastes, at least with my amp.