Any opinion or feedback on the NAIM UnitiServe or UnitiCore?

some additional thoughts....
again I have a 2TB uniti and a Pardo linear PSU with ratger extensive HRS isolation / damping I also have a big RAID NAS for backups

i will caution that unfortunately you must have a PC or MAC in the network somewhere because the NAIM backup scheduler ( desktop client) does not run on an ipad or surface ( maybe things have changed ...?....

ripping is drop dead easy
but you must take caution when ripping in a large collection - duty cycle on ripper is low and tge tgermal loads are high ( one dead Uniti )

the SQ via SPdif is quite good but is quickly being eclipsed by Tidal MQA thru the PC i have to have to run the desktop client

support via the Canadian distributer has been excellent - tgey were able to remote in to my network and get backup working

local dealer support is competent - they even shipped me an ISO image file for a software upgrade....

but i am shopping
ROON and MQA are important to me

as is ease of use...

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.