Personally, I do not see the advantage of the little NAS device as much more than a USB to RJ45 connection, which can be picked up for a few dollars. If it had several connections it might be a different story, but there is just room for one drive and one printer. I guess there is the GUI which interfaces your storage with your game device. and manages BitTorrent downloads.
Have you considered MythTV? http://www.mythtvtalk.com/mythtv.php This freeware has tons and tons of additional features, including MythGame, which is front end interface to your game console.
If you used this software and plugged your passport into any USB connection, it might skip the extra hardware altogether.