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It seems like an interesting concept. I have some resistance about P2P with my files, to be honest, but it is more reflexive than the result of any clear problem. It may not be exactly like Dropbox in the way it functions, but it seems that it could fill many of the same needs. If it is as easy to use as Dropbox, then I would give it a try. The cost of cloud storage is so low, free for a few GB in most cases, that the sweetspot of Share seems to me to be once you have considerable needs for the amount of storage and start spending more and more money on cloud storage.