I've not used the APIs in question, but I'm not sure how this can be totally unexpected, given the marketing promises and the actual technical goals. I read your comment as: "Transparent distributed storage? What could possibly go wrong!"

Wisty said it best in another post: "All sync is horrible. iCould unnecessarily so."

(http://news.ycombinator.com/item?id=5185428)

My main problem was that it only stored deltas, and thus you could not revert to any specific state if any of the intermediate deltas were lost.

Compare this to something like google docs, which has ways of handling reverts and simultaneous editing.