Fastnbulbous
500+ Head-Fier
I'm familiar with both bands (especially Insomnium) and sure there are a bunch that do benefit from big soundstages. Go into bands like Agalloch and nearly anything post- with that epic atmosphere and you will, but I would argue that unless that's MOST of what you listen to (or metal in general is only a small portion of your library) then those huge spacious cans will end up not working as well.
Side note, has ANYONE heard of anyone actually receiving the Heavys? This is getting crazy.
I just checked the FB page and people are pissed! No reports of anyone receiving anything, even though they posted a picture of a truck full of headphones being shipped out on April 28. Eh, I'm used to things being delayed.