Do not get too carried away with the benefits of NVG, yes they are very good however, they do have their limitations and in certain conditions will bite you if you are not careful.
There is an extra training burden, and I would recommend two pilots (or qualified LHS) as Speed and Rod is difficult to assess.
Finally, they are virtually unusable over built up areas and most pilots I know (including myself) hinge them up when over a city or large town.
Having said that NVG is by far better than non NVG, but they do not turn Night into day.