After further examination, a number of the features claimed on the website seem to be missing (at least on Windows).

I don't get PDF export, math mode is not enabled by default (and enabling it breaks the super/subscript text-mode notation; they're apparently mutually exclusive), the social media embedding doesn't seem to work either (I tried embedding a youtube video and it just puts up a throbber). This shows a lot of promise, but is very broken right now.

Also, the preferences dialog is buried in the "File" menu ... which I don't think is a standard location on any platform.