TestFreaks posted a review on the Sonos ZonePlayer S5
A quote from the article:
>> Sonos ZonePlayer S5 Review
Their second method to increase their market presence is the release of their first affordable stand alone music system the Sonos ZonePlayer S5. Priced at $399 it is still somewhat expensive but with the S5 the user gets a single portable receiver and speaker solution. The S5 can be easily integrated into a Sonos enabled home or work as a solo device for the Sonos newbie.
>> Sonos ZonePlayer S5 Review