I got a MetalZone the other day, to use with my old solid-state practice amp. This thing fucking kills, turned the Kustom on the clean channel into a early 90s death metal monster. So far I'm just using it for rehersals with my new band, and it slays. Could use a bit more volume, but wih a 300 $ rig, can you really complain? I might record something with it soon, since I'm guessing most people would call me crazy for saying that this setup sounds anything other than abyssmal!
But I guess it's all about what kind of sound you are going for, and for chainsaw grinding DM this works just fine!