Got them all yesterday so tested them out, viewing wise.
They all offer the same view as the stock NV mode from the skill tree.
Would have been cool had each in someway had a slightly different effect such as the panoramic NVG you get I think, from the Y2P.
Mind having paid for that I do think the clarity of that particular set is outstanding mind I do switch to a normal set to tone it down at times as the flare is four times as bad lol.
jAG
I got kinda lucky and pulled the FAST + Special NVG (FAST + Panoramic NVG is the main one I want) and noticed that about the filter, though I don't mind. I've found it easier to see with the original filter than with the new one (despite its clarity) lately. Honestly, we should be able to choose which filter we want to use in the options menu and have it apply to every NVG in the game as well as the drone, since I prefer the Splinter Cell NVG filter. At least until/if they ever introduce a white phosphorus filter, that is.