Running a WiFi dongle off my Nikon D5200 dSLR and installing Live View controlling apps on both a Windows 10 tablet and a Samsung Galaxy Note has been very successful, so far.
It gives me an intervalometer function that the 5200 doesn't natively have and allows both Live View and full camera control on the tablets (or smartphone for that matter), which can be handy for timer shots, animation and macro work. Studio photographers who want to show their work to a client as they shoot it would also have a need.
I'm using WiFi Wireless Live View Remote Nikon D810 Df D610 D600 D800 D7100 D7000 D4 D3x with dslrdashboard bundled in at no extra cost.
The dslrdashboard would work with other WiFi devices, including Nikon's own WU-1a and the like, but I can only vouch for what I have. (It also suits Canon and some Sony cameras.) You can buy the dashboard alone via the Play Store for a small fee. I'm using Android, of course (and Win 10).
The dongle I've bought needs the standard Nikon cable which comes with the camera, by the way, and just hangs loose on the cable, sadly. Whereas the WU-1a plugs straight into the connector on the camera. Other designs are even more convenient, mounting on the flash hot-shoe; but then you have to relocate your flash of course.
So far every function works with my combination of hardware, but it won't fully work with Nikon's 3XXX series and perhaps other models. The Nikon D5200, FWIW, is both a bargain and a very good DX or APS-C format dSLR. It works for me, anyway!