Last time, this was a godawful nightmare. This time, it's mostly gone okay. Took a couple of attempts to restore data, but I have address book and calendar on it. Re-entered the licence key for my extra apps and re-paired with the keyboard (memo to self: re-sync with Mac before making changes, as experience hints that it'll want to overwrite the Mac instance).
On the downside, it's burned through a weekend of batter charge in, oh, six hours. What's it running that I don't know about?