Awesome. Hopefully it's only a matter of time before someone figures out how to build one and uploads the details

In the meantime, what they're asking is *kinda* high, but also keep in mind that you can still keep any hdd you have connected while using this device.
Additionally, this can potentially open up a whole new level of access to the 360 by giving us options we didn't have before. Not only will it be easier to trade data on it with a computer, but now it'll be easier to play with "hot swapping" ideas, as plugging in/removing the hdd will reset the 360, but the memory slot doesn't.
For those of us who fix consoles for people, this'll be a great device to rescue hdds with; I had a guy who's hdd kept giving e71 (iirc), and booted fine without the hdd. I was able to retrieve his data, but the new hdd he bought could not be seen by my computer, for some odd reason. Nontheless, I could easily copy that data to an SD card (and I'm sure Datel has included software to do that, so I don't even have to have the internet), and load that in the 360 and copy his old profile to his new hdd.
I'm also sure that as bigger SD cards start taking over store shelves, this product will support it... well, maybe more hopeful that sure, as I don't know what their reason for the limit is...