I run the core on a SonicTransport and its been really reliable. The iPad/iPhone app does appear to be a bit snappier now. I have my stored files hanging off the Bryston endpoint and jump back over there to play those. SQ on the Bryston might be a little more robust but only under extreme scrutiny.
Sometimes I think I will just give up ROON and run off the Bryston but every time I play around with the ROON interface I think, Naaaah.
I still get a chuckle out of how it keeps old Sonos ZP90s in the game after all these years. Got one in my garage and W4S moded one for casual/office listening on a AV installation.