Pfff, I love it. It just needs a bit of handling of edge cases, but for those that really care about those and intend to have them in their games, it's real easy to introduce a houserule or two. E.g. 'DV doubles without armor' or '+1 Edge (ignores edge limit) if target unarmored yet dangerous'. Or the whole 'DV becomes stun, after-resist DV halved, if pre-resist DV < Armor Boost' idea.