I have this lens, I've discussed it here a few times.
For me, it fits a nice niche for travel (real travel) when I just simply don't want to lug a bunch of stuff that I may or may not use, and then gets in the way of enjoying the trip.
This lens does pretty much everything, and pretty well, too, but does nothing spectacularly except save space and weight.
It's not crazy fast, it's not crazy sharp. It IS lightweight and versatile. Overall, it fits my needs well, and I give it 4 out of 5 stars.
It is nice quality, feels good in hand, and has taken a few knocks will no ill effects.
I have the trinity, great primes, micro(macro), and a couple of specialty lenses, all by Nikkor, and I am not afraid to spend on quality gear, so I have a good perspective on what it is and isn't. I think it's worth the $1K. Unfortunatley, I do not have any real experience side by side with a Sigma or Tamron equivalent lens.
edit to add: It rides on a D850, if that matters to you.