Eyemaster Metal Distortion brings back the original metal credo of "loud and brutal" with its "simpler-than thou" 2-knob operation.
Just set the volume (all the way up, right?) and adjust the gain (anything less than all-the-gain is sacrilege) and start riffing.
Eyemaster was specifically designed to channel the Swedish death metal tone, endearingly nicknamed the "Swedish buzzsaw". As that term implies, Eyemaster is not a subtle overdrive.
It is not transparent and it does not "sit well in a mix". Rather, it burns an unholy path straight through the mix.