According to the Lifehacker article on building a Hackintosh, the process is a lot less fiddly than it used to be, and a lot more hardware is now supported.
Other guides suggest that the NUC is mostly supported, bar a few issues (e.g. on-board mic doesn't work, not the infra-red sensor).
However, even if you have a totally legit paid-up copy of OS-X, it's only licensed for installing on Apple hardware.
For most of the hackintosh ports onto the NUC or NUC-style hardware, the onboard Bluetooth/WiFi is usually not supported because there are no OS X drivers for the integrated chipset used. This is kind of a deal-breaker for me. The process of applying new OS revisions is also painful. I guess the hackintosh process is pretty straightforward on certain models of full-size motherboards, but I haven't seen a fully functioning SFF impementation. If there was one, I would get such a box.
My experience is not recent, but I ran hackintoshs for about 3 years in the early days (dates are fuzzy but 2008+).
Recently, I looked into NUC's and mini-PC hacks and I don't think Broken BT/Wifi is correct as long as you pick a supported platform. There are mini pc's that work I'm sure. I had a Shuttle SFF working flawlessly back then. The main issue now is getting call forwarding working (call rings on your phone the hackintosh answers it). There is a place that sells an aircard/ide combo for $150. Yes expensive.
The updates. OMG. Yes, this is what made me buy a Mac Pro. Back then, when there was an update it was return to Windows land. Crashes galore until you tracked down every little issue on the boards and mitigated them.
For someone that doesn't need to update their system often, a hack could work out. I loved it, could boot into Windows and play games and then boot back to OSX for video editing etc. But eventually did a cost benefit analysis and I was spending too much time on the updates that were required by the s/w I was using.
Other guides suggest that the NUC is mostly supported, bar a few issues (e.g. on-board mic doesn't work, not the infra-red sensor).
However, even if you have a totally legit paid-up copy of OS-X, it's only licensed for installing on Apple hardware.