I am going to the store today and run a ethernet cable to the Sonos ZP90 upstairs. I live in a mid-century modern house that is split into two levels and it is impossible to add a wire anywhere hidden, think no attic or subfloor, so the wire will be surface mounted. Wife is already b****ing. The main thing that got me going is that in all the articles I read, and reviews, not one mentioned that you had to have at least two Sonos boxes to use the wifi capibility. As I said above, the web site does make a small mention that is very tiny compared to all the hype about the wireless streaming. I also thought that the whole idea of wifi was that once you had the router set up other wifi devices could access the router. I have never heard of a wifi device that can't access the router directly and not need another device. Hopefully this will end my quest to have better access to my music. With two listening rooms and two stereo setups, one for multi-channel home theatre, I am hoping that my days of CD's laying around the rooms are over.