I have a trilogy of Demonizers...one set for clean, one for heavy crunch, and the third dialed-up for mid-boosted solo tone. I use a buffered signal splitter pedal to switch between them, and all three run into a small mixer w/ effects, and a pair of active studio monitors. I live in a small apartment, so this setup works for me better than a traditional amp, and sounds 1000 times better than digital modeling, imo. the Demonizer has an excellent sounding direct out jack that has the thump and resonance of a cab.
anyway, yes the Demonizer can do the full gamut of metal tones, from vintage to modern. I'm into old-school speed metal and NWOBHM and it took me less than 3 minutes to get "the tone". the Demonizer can also produce a most beautiful clean tone...I love electric clean, can't live without it.
these pedal/preamps are pricey and some may find their price tag impractical , but for my ears and playing environment, the Demonizer is a true bargain. I'll get some clips made if you'd like.