Looks interesting, and I notice they have 750gb drives already. 1tb is the point where I'll seriously start considering buying a SSD (the above comment was a bit of a joke) and I may just hold out for 2tb. I was figuring within the next two years, but, may not even take that long...
That being said, I personally don't trust a drive designed to be used internally as an external drive. A bit part of my reasoning is backup, so I'd prefer a product designed from the get-go to be outside of a computer. Though, I suppose a good enclosure would solve that problem.