So I have a list of criteria. Not a long list (in fact length of feature list is a negative indicator -- I'm looking for something simple but of course it has to be the kind of simple I'm looking for. :)
Versioning is awesome, and something I considered most-desired but least-likely to find. I also like that you chose iCloud over a custom sync service, for a lot of reasons.
Do you have any interest in using strong encryption for data at rest?
Two notes regarding marketing: "yet another X" is an in-joke among UNIX people, so it works here, but might not fly in a wider audience. Also, posting on a Saturday at 3am US/Pacific might be self-limiting..!
Nice work and good luck with it!