Well...
One of the great things about the Sonos system is that it creates its own Wifi mesh network, using each station in each room as a transceiver, so you get a really strong signal all over the house. Most houses have just one Wifi router and if this gadget relies on that for its signal, it's not going to work very well if the house has any black-spots (my kitchen seems to be dead to my own Wifi, but the kitchen Sonos works perfectly as it is fed by two other neighbouring Sonos stations).
so as a house-wide system, I suspect this won't be hugely reliable - at least not as reliable as the Sonos system.