I cannot say without any experience with it BUT reviews I've read (while I would not expect audiophile nirvana) seem pretty positive about the audio. I'm sure we will read more here about it in the near future.
I assume by default the Dolby Sound would be enabled so that is something to check for I suppose. If I buy one, maybe I'll load part of Beethoven's 5th. The opening should be enough for a test.
One I've read stated it through off a pretty decent soundstage for such a small device.