-No cache manifest, so internet connection is mandatory
-It defaults to local storage for your notes, so the notes are basically saved in your browser
-Syncing works via Dropbox (not an option for me) or SyncStorage, which I never heard of before and which requires yet another server if you want everything self-hosted
-You have to download all the dependencies and build the app locally for what could be a simple tarball -As far as I can see there is no API to build upon if you want automated notes or a custom app (though you may be able to do this via SyncStorage)
Another important fact is that it's not nearly as feature rich as Evernote, so the headline is actually misleading.
I'll stick with my current BTSync/Markdown files workflow and check back in a few months.