For those of use without Apple devices, could you please elaborate on what this "deep integration" consists of, in particular ways in which it surpasses Dropbox

For those of use without Apple devices, could you please elaborate on what this "deep integration" consists of, in particular ways in which it surpasses Dropbox? Also, at the end of your comment, you say "that Apple will build", implying that some of iCloud's deep integration is yet to be delivered. Is this correct, or did you mean something else?