PVS-14s are military issues NODs, from the looks of the supervision, it doesn't exactly seem weapon mountable nor helmet mountable. But it does offer an alternate technology, much like making pictures seem brighter by prolonging the time the shutter is open.
I still think its a bit overpriced, though I might be wrong. There is a Night Owl Gen 20/20 or something like that, it operates on the same principle, but it's only $400 and has more "features" I guess.
I saw a brief review comparing this and a PVS, the PVS won I think.
Cheers