I got one a while back for $100. its a good price for what you get. I have it on a shelf in my kitchen, where it serves up tunes during dinner time. It also acts as a convenient spot to charge my phone/ipad -even while its not playing music.
I bought one too. The airplay is kind of sketchy. Not sure why but the signal from my iMac to the doc drops randomly forcing me to go through the lengthy set up procedure to reestablish the link. I bought the device specifically to play music in my workshop which is located 10 feet away from my router through an exterior wall. My laptop communicates with the router when I have it in the shop so I am assuming the AirPlay feature is not working as I expected.