Before I start, these are simply my own impressions. I was once a professional photographer way back in the days of film and photographed over 600 weddings, as well as sports teams and schools. Nowadays I am just an amateur who sells prints once in awhile. I am also a recently retired economics teacher and in my quest to upgrade from my excellent, but outdated D7000, I applied the principles of wants vs needs, trade-offs, opportunity costs, and cost benefits.
Realizing the no camera will give one exactly what they want, I borrowed the requirements down. My two main criteria were higher ISO performance and more accurate focus. I do a lot of bird in flight, and both are essential. It came down to the D7200, the D7500, and the D500. The D7200 already being two years out, I ruled it out. The D500 fit my needs, and a few wants, but the price tag was a bit steep. The D7500 seemed the best fit, and after trying it for a couple of days I believe I made the right choice.
ISO- While the D7000 had an upper limit of ISO 1600 before degrading, I now feel quite comfortable at 3200 which helps with the 180 f/2.8 for birds. I will test at higher when I do some Milky Way shots next week.
Focus- Spot on, fast and accurate. I can track a bird quite easily.
Exposure- Amazing. The color rendition and exposure are so good I don´t have to do any tweaking. Even shooting a bird against a bright blue sky the metering handle it.
Eight frames per second is fast. The shutter is quite sensitive and I will easily shoot a sequence when only one is needed, but they delete.
The shutter is much quite quieter than the D7000 and makes a sweet sound like my old Contax.
The negatives that people are sounding off on don´t bother me. One card slot is okay, I never utilized the second slot before, and I am not doing anything that a card failure would cause a catastrophic loss. No battery grip is okay too. I have one for the older camera, but never used it. I am so old that reaching over with my finger feels natural. Not being able to meter with old lenses is okay too, I don´t have any.
The bottom line is that this camera meets my needs, and then some, giving me a good return on investment.