I don't play death metal or any metal at all.
But for $325 the Fender Mustang III w/Celestion 12 is the best $325 I have spent in many a moon.
I didn't keep any of the #00 - 80 factory presets. Those, IMO, are just to show you what the amp can do.
But I did keep all of the amp emulations from #81 - 100.
I use the Marshall, Vox or Fender amp emulations merely as a starting point and by the time I'm finished they sound nothing like what they started off sounding like.
Then I replaced the unwanted factory presets between #00 - 80 with with those new presets that I created, leaving the amp emulations between #80 - 100 unaltered so I can use them as a foundation for new settings again.
The amp has wonderful reverb and delay that's fully adjustable.
And the overdrive and distortion pedal emulations are superb.
I'm certain that if I were a death metal kind of guy I could dial in any tone I desired and store those presets.
The secret, IMO, to using a "modeling amp" is to use the amp emulations only as a starting point from which to create your own dramatically different sounds.