Sure, it is an awesome product for Digital Radio listeners. It started out as a product for playing all your own stored music from your computer or nas to your audio system. It uses its own mesh wireless network which is much more reliable than 802.11 and it lets you create multiple zones throughout your house by adding additional zone players. The boxes are very compact and have analog and digital outputs to work with a large audio system or something small like a Bose wave radio.
A couple years ago they added the online music services which now include Rhapsody, Pandora, Sirius, and Last.fm. So you can play all those services through your audio system without your computer. It has a very high quality DAC and produces great sound. Rhapsody streams at 192kbs and others stream at 128kbs. I do not have any stored music and only use the online music services. I have two zones.
You can control it with their CR100 handheld controller, desktop controller installed on a laptop, or the new Apple Iphone/Itouch controller. The IPhone/Itouch and desktop controller software is free. The controllers can control what music plays on each zone and the volume, and it shows you the now playing with album art.
What i really like is the reliability. It just works all the time. When using my laptop or Nokia tablet to play music services, I always felt like I needed to poke and prod and restart it to keep running. Every time I turn on Sonos, it starts right away, no skips, no drop outs, and it keeps going for many hours, subject to the music service timeout limits.
You can get started for a reasonable price of $349 for your first zone and use the free controller software. It is easy to add more zones later. The product is similar to Tivo in that it is self-improving with new features and services added to the zone players a couple times a year. But I find the quality of their software releases to be far better than Tivo.
Many hours of music played every day at our house!