Took my new D500 out for an exploratory session this evening, most enjoyable, despite only my second 30 minute session. Wow, I love it. I took a risk when buying it rather than hiring, like my much more sensible friends here on TP!
Please allow me to explain...my DSLR history is as follows: from a Fuji bridge (something or other) save save save, and then,...first DSLR - D300. Loved it and then I was just sucked into the hype of FF. The next 'natural' upgrade considering how I very much appreciate innovation and technological evolution was to move to the 'all conqureing FF', was a D3S, never mind this nonsense - you guys refer to it as GAS. I was actually only in the market for a D700 at the time but when a D3S came along at the right price (I'm sure no one here would criticise me for going for it!), as it was a non-optional camera-technology convention after all! Despite my good fortune of acquiring a D3S from a friend (awesome tog) I then made a bit of a mistake. A mistake only, and I can't stress this enough, mistake only due to what I loved the D3S for (e.g action - of any kind, wildlife or motorsport) I foolishly (for me, this is only my opinion after all) I sold it to enable the purchase of a D800. Oops! My shots took an enormous, to my eye, plummet in quality.

After about a month of trying the D800 in different conditions and trying to improve my technique knowing about the 36mp showing up any flaws in technique (shakey-hand-man) in a shameless and insulting manner, I decided that my mistake was going to cost me!
Next came a D810, at more expense, this was much better, ergonomics alone made this a more natural fit (sorry!)....but, for my purposes, something still was wrong...enter the D500. Thank you Nikon!
As much as I fully appreciate the benefits of the D810 FF (or D8XX) camera as illustrated by
@BillN_33 early in this thread, which I still do, the camera was still not right for my intended subjected matter (action, wildlife, BiF) despite its awesome croppability. I purchased the D500 to have in addition to the D810. Without having any examples to show you (too embarrassed to show my shots on here with so many great photographers) and as much as Nikon had said from the initial launch of the D800, different cameras for different subjects...they were so right. Again, welcome D500...for what I like to take shots of.
At this time, due to my love of macro and landscapes, I feel very fortunate to have both a D810 and a D500 but only because each camera is focussed (sorry) on very a different subject matter, or at least it is in my, most amateur of enthusiast hands.
For anyone considering a D500, please stop and consider what you like taking shots of! Considered shots, landscape (tripod, low iso) macro (in good light), immense croppability great, go for one of the D8XX range otherwise lose the DX/FX snottiness and definitely consider the all-round capability, albeit expensive, of Nikon's high-end APS-C D500. I haven't even tried it with anything other than a 300mm f/4 PF +1.4 Mk III TC and its ability to give me sharp BiF is incredible. This may say more about me than the camera but, 'oh well'.
What do I love about the D500 so far? (bearing in mind less than 60 minutes of use!):
1. AF speed - and accuracy. This is number one by far.
2. Customisation, the sub selector AF-ON, alternate AF mode, genius. So simple but genius. Nikon, how have you not always had this???
This has been mention by
@Dave Semmens and
@gramps and others previously but this nice article explains its importance,
https://www.flickr.com/groups/393420@N25/discuss/72157669060554191/
3. Articulating, great resolution, touch screen.
4. Light weight (although not great balance if using a heavy lens).
5. Great low noise high ISO ability for a APS-C sensor.
I can't wait to get out with this camera again for BiF...... but the D810 is still a brilliant camera for the correct purpose and for once I took the expensive gamble of having both rather than embarking on a part/ex arrangement.
Thinks for reading and sorry for the long post!
Please bear in mind that all of the above ramblings are just my opinions.