I don't know if high-rez wireless synchronized music "works" in a multi-room core product. I hope it does, but I wouldn't buy Sonos if you are really care about high-res.
I gues time will tell but in comporaing Sooloos to SONOS one needs to compare Sooloos to a wired SONOS system because the Soooloss is wired...
I can also tell you that a wired SONOS is bullet proof...I have 9 SONOS units in my house with 7 of the 9 being hardwired and the hard wired are bullet proof (i.e. never ever fail) and the wireless ones are near bullet proof (i.e. once every 3 or 4 months there is a momentary drop out in one zone due to some wireless interference but, all and all, it essentially always works)...