Pity that it's only a stero amplifier - not much use if you want to output any of that Dolby Digital 5.1 they've got splashed all over the web site. I hope the prices mentioned above are wrong because for that sort of money you can get a damn good AV amp which will do pretty much any thing this can do and much more when connected to a digital feed from your pc.
I can only assume you haven't realised how small this unit is. You're not going to get decent amplifiers for surround speakers in it.
Having a stereo amplifier is great for connecting a decent pair of passive speakers for music, for gaming or when watching movies. Sure, it's not surround, but it's far better to have decent stereo amplified output, than it would be having cheap quality amplifiers, like those found in 5.1 PC speakers.
It has 5.1 line out for powered speakers, so the Dolby Digital can be accessed. That is good for enough for connecting 5.1 PC speakers for gaming.