Sounds okay actually
Your initial description got me hooked. Whilst I know what bit torrent is, I couldn't give a crap about it. iTunes is the spawn of the Devil so that's another plus. And given that, as you pointed out, the Media Centre version is aimed at the home market - how many homes do you know have gigabit ethernet networks? I certainly don't. Most are going to be plugging this into a 10/100 port on their ADSL router and sending it out over homeplug or wifi. From your figures, it looks like the device can make pretty good use of an 11n connection and can certainly saturate a homeplug network.
So, actually, it starts to look quite decent and the price seems pretty reasonable too.