I don’t recall if it’s WiFi, but I’m quite happy with the Holo Red, for not much money, driving MMT via AQ Diamond USB. Much better and clearer than the MMT Ethernet input.. I didn’t like the AES output as much but I was using a lesser cable (and I prefer not to lose the high res formats). The Holo Red also functions as a USB-input DDC I believe, though I haven’t used that configuration, and it supports many protocols, ie Airplay, UPnP, HQP NAA etc.
It’s not a server so no built in SSD - there are of course server options (I previously had Antipodes CX / EX) but for the money I’m much happier with a commodity i7 NUC core and a dedicated streamer.
Of course a MU1 would sound better, it’s just doubling the price of the MMT.
I did hear the MU2 at Münich, from what I heard it is top tier, I will probably have no choice but to buy one eventually.