Savage,
It's not that you won't get the full effect of the mod, you just won't experience it the same way that someone with a three monitor setup will. However, I can say that about any aspect of the game. If you don't have the triple monitor setup, you won't have as much peripheral vision anyway. I imagine that they're going to do something -similar- to the full screen NVG mod, although maybe not so simple as removing any aperture borders, for folks with a single monitor. For those with a tri-mon setup, they'll just have to expand that custom view while under goggles. I don't know the specifics of how it works but the TLDR version of this is: you'll still get the full effect of the mod and can save up and spend your $600 on something else.