I've got an Airport Express on order, I haven't tried this proggie yet. The thing that confuses me is, what is the benefit of using this over the built-in iTunes sharing over Rendezvous?

If I'm using the iBook in the bedroom, I can use/control the iTunes library and playlists that live on the iMac in the sitting room without any extra software. Does this bring something extra to the party?

BTW - I'm no knocking the software, after all I haven't tried it, I am just looking for info here.