Ethernet is absolutely worth it. Streaming video or audio will benefit from this. Having a wired network can help improve your wifi network because you can pu

Ethernet is absolutely worth it. Streaming video or audio will benefit from this. Having a wired network can help improve your wifi network because you can put wireless access points anywhere you have a wired connection. The combination of Apple's iTunes + Airport Express + Remote app works very well. But it's much more reliable on a wired network. I used to have this setup on a wifi network, and the music would cut out every so often, but that was because my wifi network was unreliable. Also note when it is on ethernet, the Airport Express can also function as a wireless access point at the same time as streaming music.