Prediction: DOA.

One of the selling points they focused on was the ability to let a friend who is visiting your home share their Google Play library to your stereo/TV via your Nexus Q.

OK, so, I'm going to buy this little device so that if my friend comes over to visit and if they have an Android device and if they use Google Play to get music/videos then we can use their content at my house. That's a dead on arrival selling point. It's something that I might take advantage of if I already have the Nexus Q for some other reason, but I wouldn't buy with that use case specifically in mind. Especially for $299. No way.

Then what is the selling point for Nexus Q? It looks to be a way to stream your music/videos throughout your home, like Apple's AirTunes or Airplay. Like a number of other systems that are available for tapping into a library on your PC and streaming content to your stereo/TV. Like Microsoft's media center technology.

I don't see the Nexus Q going anywhere today, but if Google sticks with it like Apple has stuck with Apple TV as a hobby, maybe someday.