Yeah, I've heard of that unique, but never that you could get two at once. Not very "unique" now is it?
I finally got to the necessary level to use Gau's Equalizer. It's nice, but it has a very slow rate of fire and also a very limited range (of course, since it's a shotgun pistol). I'm using it and Max's Molten Metal Projector at the same time and they seem fairly effective if I let enemies get near me. I use my sniper rifle and a fire based machine gun more often though, as they're able to pick almost everything off from a distance.