I'm an AV dealer/installer and sonos is absolutely incredible. I just hit gold dealer status with them, Ive been direct with them for years but just in the last year im installing more and more of them. Even in new construction homes were installing them in a central location and using in-wall ipads around the home to make quick and easy access to the system, and finally we have the ability to integrate them into our home automation systems!
There is a rule of thumb with the "bridge" though, Keep in mind that for optimum performance and so your music doesn't get compressed when you have all of your zones on that for every 4 wireless devices you need 1 wired. Also keep in mind that ANY sonos device can be the start of the system so sometimes a bridge isn't necessary.
another thing that is REALLY nice is that say you have a connect or connect amp that is wireless and you have a laptop,desktop blu-ray player, tv sonos can act as a bridge. Just connect a ethernet cable from the sonos device to a device that you want "hardwired" and voila you have an instant connection!
One last thing; and this is the MOST IMPORTANT is that sonos relies entirely on your network. Anything more then 3-4 sonos devices on your ISP's provided combo modem/router you really need to upgrade to a more powerful router. Otherwise you will grow to hate your sonos system due to all of the connection drops.
Im very well versed in sonos and constantly go to factory training's. Im here if anyone has questions or issues. Just PM me or contact me through my website!
Ohh! and the "sonos sub" is very impressive!