If you prefer video, then cue up the walkthrough.
I'm not sure what's so hard to understand. I have a laptop. I buy this, it syncs my audio/video/photos automatically, so I can watch/listen on my 42" Plasma & stereo. It can also stream same content from my wife's laptop and the iMac I have upstairs. It also lets me view movie trailers and a few other little things.
That's pretty much it.
While none of that is, in itself, particularly earth shattering, it is exceedingly convenient. I do not need to spend money on a 'real' computer hooked up to my TV. I do not need to work out a sync solution between my laptop (which I live on) and my 'media center'. I do not even need to open my laptop to have access to my music/video/photo libraries.
Again, not earth shattering, but pretty cool.