Just bought a G&G myself recently, but not the MIT version.
Works well. I bought it just to see how it held up to the recoil of my GBBR's and it's holding surprisingly well.
Only downside is that it's a huge can. It's like 8 inches, and I predominantly play indoor as well and I can't see myself running an extra 8 in front of my rifle.
My PDW, maybe, but even on 10.5" barrel M4's or SCAR it's just too much up front for CQB (at least for me) to manipulate and negotiate without it smacking on the floor from primary to secondary, or even trying to aim/hide through windows/structures.
But overall, I'm happy with it and I would definitely run it outdoor at night.