on the Mesa v-twin, on it's own it's not suited to metal or any aggressive rock. the overdrive/distortion is thick and sludgy, far too bassy and muddy for metal. the red channel has plenty of gain, but it's very muddy. however, when i combined the blue channel with a Marshall guv'nor i got a fabulous, aggressive hard rock/metal sound. a lot of money to spend though, when i'm sure you can get just as good, if not better, from a single, cheaper, pedal. those blackstars look good.