> Our target audience is personal users, families, or groups of friends. Although Upspin might have application in enterprise environments, we think that focusing on the consumer case enables easy-to-understand and easy-to-use sharing.
This definitely does not look "easy to use" unless the target audience of families only includes families where all have technical backgrounds. If I gave anyone in my family that list of instructions they would stare at me blankly. There is a reason Dropbox does so well, its simple and doesn't require you do any manual fiddling.