EQ pedals always a nice thing to have for a bit of extra scope, y'know, particularly in a metal context.
For example, if the rhythm guitarist is "scooped", you can go in "humped" for a solo, so you cut through, but I suppose it's just for that bit of extra precision.
By the way, if you get the chance to try the metal muff through a vc-30, any chance you could let me know how it goes, as I'm on the cusp of buying one.