Just pulled the trigger on aliexpress with the AS318 option (I did more research and can confirm the box works with Mac). While I don’t have much high hope on it given that I cannot hear any difference between X-SPDIF 2 and my current cheap setup, its price and convenience probably can justify the purchase even without sonic improvement…
Got my AF200 yesterday. It can work on Mac as long as one disables the support for super high sampling rates (DSD1024, PCM1536, etc.) using a tool running on Windows. Nice little box.