My guess is that the sound quality is good, but not excellent. Better than computer speakers, better than the cheapest bundled units, nowhere near good enough for audiophiles. But that is only a guess based on what should be achievable.

With the limited functionality, it's just too much effort to order banana cables / connectors. I was hoping Google would announce it was now "unlocked" and they were supporting running more apps (the hardware & software are fully capable of running general Android apps with the Android SDK tools, but there's no easy way to interact with the apps). It looks like that's not going to happen now.

e: really, is downvoting appropriate here? I can quite easily speculate that i don't think the nexus Q sounds that great (and thats what i'd put my money on), but the electronics exist, and cheap enough, to allow it to potentially sound fantastic. I was hoping someone might have some first hand experience to get better than speculation.