I might be a little cautious about expecting all Sooloos kit to be able to decode MQA in software. Looking at the processor utilisation on a MacBook Pro running a quad-core i7, Tidal/MQA is routinely running at about 45% processor load ... and that's on a fast, modern chip.
Some of the older versions of things like MC200s - which were designed to be fan-less and silent - might well struggle with the MQA processor load whilst remaining within their thermal limits. I mean, we don't know until the new firmware arrives, but the extra processing requirements might mean some Sooloos hardware can only pass-through MQA to a 218/818 for decoding. Time will tell, I guess.