i tried the grainger hammerhead in soundcontrol (before they went bust) at pretty low volumes- as far as i'm aware, it's the same thing, just rebranded for sound control.
I thought it was pretty decent for the money; bear in mind, though, that the graingers were much cheaper than the epi versions- just before SC went bust the halfstack (including 4x12 cab) was going for £200! It's mainly a rock amp- cleans were decent if unspectacular, and it had a decent rock overdrive. Not really metal, but i guess it could be boosted to do it at a pinch. I remember thinking it was a bit noisier than I'd have liked though. a lot of the budget tube amps are like that, though.
Basically, if you can get one cheap enough (say, under £300 or so for the halfstack?), it's decent, but I wouldn't pay the original prices they were going for over here (£600 for the head? :lol: ).