offsite file storage/access

Just saw a new device that is not even out yet but it looks promising.
PogoPlug
The idea is a small unit (L x W x D): 4" x 2.5" x 2" , that plugs into an outlet and has two ports on it.
One ethernet to plug into your router, and one usb to plug into a usb hard drive.
They claim that simply plugging it in makes it live and you can login via a web interface to access your files from anywhere in the world.
If this thing works like they say it does I am seeing some good ways to save money.
Many businesses pay for offsite backup of their data, a quick and dirty approach is to backup data from your office to your home nightly using this device.
Total cost under, $200 for the pogoplug and a 500gb hard drive.
If anyone has used this thing yet I would love to hear from you.