I have her since beginning May, quite possibly the best camera I ever had, including the D3. The only field where she is a tad behind is IQ and post production capability in ISO higher than 1000.
Well, I totally agree about the D3. I do not believe however the D500 is lacking in IQ when it comes to high ISO shots - not much anyways. I think it depends on the eyes that see and how much noise bothers you. One of the great advantages if you got a 600/4 like me is that you hardly need to crop anything anymore so you don't lose IQ to cropping as you do with f.ex. the D4 which I owned before. Of course the best of both worlds would be to own a D5 and a 400/2.8 for when it turns real dark and the D500 + 600/4 VR combo that I have but I can't afford a D5 and I am really happy with the 'reach' of the D500 so far.
This one is ISO 20000. I did a bit of post processing on noise but it is easy to remove color noise - much easier than say with a D810.
JNR_8081CNX2s by
Jens N. Roved, on Flickr