I've been contemplating the benefits of NV. Mind you all my experience is from a Bortle 6 light polluted sky. I'm also currently not taking photos through my device, which appears to provide more detail once dialed in (smart phone or what have you). I have future plans to try this out a bit.
My view on NV with telescopes is it provides a view similar to a dark sky through eyepieces (maybe not quite as sharp/soft a view). But not really competing with even EAA astro-photos except on certain objects. Such as the Orion Nebula looks better than many EAA photos. And of course full on astro photos provide a much better view. This was apparent to me when moving back and forth between Stellarium and looking at my scope.
So while this has provided an improved capability when observing at home through the telescope. The improvement for me is more not having to drive to a dark sky to get a similar view. I don't want to downplay what an improvement that is, but just want to point out what it is and is not.
So for me, I think the biggest benefit is what this has done for extreme low power observing. I don't have a 3x adapter and have not yet outfitted my camera lenses to accept filters (should be pretty easy to do so with some epoxy). But even 1x observing is pretty neat. Seeing satellites and shooting stars is very cool to me. In the summer I got a pretty cool view of the Milky Way. Not quite dark sky Milky way but decent Milky way. And some of the larger nebulas are neat at 1x. I'm thinking 3-4x would be even better on some of these larger nebulas.
The recent posts about getting two devices setup for binoviewing is interesting. Maybe someday I'll be able to afford this. But I think it will be a long time.
What is your biggest benefit gained by doing NV? Have you found the benefit proportionate to the price? I got my unit used and I feel like the benefit is close to the price I paid. But I'm not sure I would feel that way if it had cost more. Or is the fact that I've only used it in light polluted skies the difference. Kind of like if you upgraded to a 10 inch dob from a 6 inch dob. In light pollution you may say, well, it's better but still not a huge improvement. But in dark skies you realize what a 10 inch dob can do.