Any opinion or feedback on the NAIM UnitiServe or UnitiCore?

you may want to post your question on computersaudiophile.com

it's right up their alley and there are many cheaper ways to do what you want than the Naim units (which are for more complex multi-room systems)

We are a Naim dealer, a Lumin dealer, a Naim Masters dealer, and an Aurender dealer.

A Macmini doesn't sound anywhere nearly as good, we tested one with pure music vs most of these dedicated devices, and there was actually a rather large difference sonically. 

If we can be of assistance please reach out. 

Troy
Audio Doctor
www.audiodoctor.com
877 428 2873 

i have a Naim 2TB Uniti with a Pardo linear PSU. it is hyper easy to use when everthing goes well. I would suggest selecting a dealer who can get it up and running on your network including the backup to NAS. 
the SQ via SPDIf is fantastic and Radio Paradise at 320 kb is excellent.
i stream more and more thru Tidal now via usb but the Uniti is an excellent server with a bit perfect ripper.

I can second the recommendation on NAIM servers, but he new Uniti-Core far surpasses their previous iterations in simplicity and usability and at half the cost.  Setup couldn't be easier.  I'm not aware of any bugs in the new NAIM app.

I don't make money by selling audio components, and a mac mini can be made to sound just as good for a lot less money.  if you have a really complex setup the Naim items could be the way to go.  also big black boxes may look cool to you, so...