Sonos Connect Amp: Part music streamer and part amplifier, this device lets you use your favorite speakers with Sonos multiroom audio components. Don't throw away old speakers; give them new life.
have one for each room. guests can play thier own music when they sleep over or I can have continuous music throughout my house. Sounds great and I have reached a new enjoyment for listening to my music or radio stations. Highly recomend. Not cheap but best thing I have ever done for enjoyment.
What's great about it: easy to use, flexible, can play different music in eveery room or same music in all.
What's not so great: can't think of any think I don't like about this.