Just my suspicions: That's about a $300 item. I bought a 1TB Hitachi SATA2 bare drive back in December for $285 (Newegg). You'd still need a case, of course. But this item sounds like it includes a router/Internet accessible board that would allow you to contact it from anywhere. Access via the Internet will be slower than Ethernet for sure. And your ISP probably has a much slower upload speed than download. Local connections would be much faster assuming it's not a USB 1. And it includes at least one USB port, probably USB 2.0 (approximately as fast as FireWire 400, assuming nothing else is using the cpu). The specs are rather thin on exactly what you're getting. No mention of FireWire, probably not there. If you have a recent Mac, you'll likely have 1000 Ethernet. But I'm not sure how that speed compares with USB (1 or 2). I'd suggest looking in the Western Digital site for more info.
As a bare drive, the price is not too high and for another $15 you'd be getting more stuff than I did for what I paid. But you'd have to know more about the drive speed, buffer size, other connections as well as how the drive is already formatted. I'd bet DU could change that if given the chance.
Some have a low regard for WD drives, also.
Here's a link to <
the drive at WD's web site>. Looks like it's strictly an Ethernet connection. The specs also say you should have: "Available Ethernet connection (network adapter, router, switch, or hub port)." Only PCs are mentioned so only Windows OSs are too (Vista/@000/XP Home or Pro). BTW, it's $350 over here!