For anyone reading this that is on the fence about getting into the Sonos system, I have some advice: Just buy it!
When I first read about the system a few years ago, I thought it seemed like an interesting way to distribute music in the house. The price was the only thing keeping me from taking the plunge. Then they came out with the iOS controller system that allowed anyone with an iPhone, Ipad, or iPod Touch to operate the system instead of the expensive proprietary Sonos remote control device. We have an iPod and and iPad in our household, but I was still reluctant to part with the cash for the players.
A few weeks ago, I found a local dealer that demo'd the system for me in person and showed me how easy it was to control the system from a PC and iPod and I was hooked. I promptly snapped up a ZP90 and an S5 player and took them home.
I have a networked hard drive (NAS) in my basement where we keep all our family pictures, movies, and of course music. I hooked the ZP90 into my family room AV receiver, routed the ethernet cable that runs to my PVR through the ZP90's ports (I used the supplied ethernet cable to daisy chain the signal back to the PVR - which means I did not need to run another ethernet cable just for the Sonos system), installed the Sonos software on my PC and iOS devices, and within 20 minutes, I was listening to music in two different areas of the house.
The ZP90 sounds great through our AV system in the family room, and I am also very impressed with the sound of the S5. We also have one of those Bose Sounddocks that we used to plug our ipod into for portable sound, and the S5 blows the Bose away in terms of sound quality. Much more bass (but not boomy), and much better mid range that really fills whatever room we take the S5 to. I plan to get some outdoor speakers for our patio and run them off of the family room AVR's "zone 2" outputs, but in the meantime, the S5 sounds great outdoors too.
Our family has been listening to much more music lately, and we have even discovered a couple of really cool radio stations using the Sonos software. My only regret is that I did not get this system years ago.
PS - anyone want to buy a used Bose Sounddock?