well, I have the whole 3D setup here and played a good few games with it. For the first few times I tried it I thought it was pretty amazing. But after a few days it lost it's wow factor and really became more of a pain in the ass to use.
I don't use 3D at all now. My view on it, 3D isn't there yet. It's getting better but it's still not right.
Saying all that, I think you should get a 3D monitor, not for the 3D but for the 120hz because that will make your FPS gaming experience much better.