I got my hands on a JBL Soundfly, but it shows some trouble when I connect it to my home WiFi, which consists of 2 first generation AirPort Express linked by a cable to create a shared network.
The AirPorts are set to 802.11n only (2.4 GHz).
When I stream music from my iPhone via Airplay the connection gets disrupted a lot (noticeable audio gaps).
When I attach another WiFi-Router to the network, and connect the Soundfly to that AP, it plays without problem.
Does anyone have the Soundfly running in a similar AirPort Express network and does not experience any problem?