Libratone Zipp review | Hi-fi and av speakers Reviews | TechRadar:

"Is this woolly AirPlay speaker a wolf in sheep's clothing?"

Sonos SUB Review - SlashGear:

"When you decide to pick up a Sonos speaker, you decide to jump into an ever-expanding ecosystem of both hardware and software, with a brand that’s dead set on pushing an immersive experience out to the customer. With the newest member of the family, the Sonos SUB, you’ve now got an earth-rumbling bass component in addition to a couple of sets of high-quality speakers and several center points – dock, bridge (hub), amplifier, whatever you want. The big question you should be asking yourself here is not just if you want to work with the magic that is the SonosNet wireless mesh network, but if you feel its necessary to pick up more than one of the Sonos family components."

Sonos for iOS adds direct device streaming, takes PCs out of the equation (hands-on):

"Sonos has been steadily reducing our dependency on the computer as the cornerstone of its multi-room audio system, but there's been one link left to cut: local music. Outside of an AirPlay workaround, a PC of some sort has always had to stay awake to stream a personal collection. If you're an iOS user, it's now possible to go truly PC-free. A 3.8.3 update for Sonos' apps plays music stored on an iPad, iPhone or iPod touch directly through the system, with no hoop-jumping required. Local content is put on equal footing with pure internet sources, too -- the software can mix local tracks with those from Amazon Cloud Player, Spotify and other internet services as part of the same playlist. There's no official word of direct device streaming for Android, although we wouldn't be surprised to see it follow before too long."