While it's not firsthand, this is a good summary: http://news.ycombinator.com/item?id=3276466 http://news.ycombinator.com/item?id=3276466 In short, it boils do

While it's not firsthand, this is a good summary: http://news.ycombinator.com/item?id=3276466 http://news.ycombinator.com/item?id=3276466 In short, it boils down to problems around authentication while sharing by means of replication.