Rated 2 out of 5 stars
Works well enough, but I certainly agree about having to register with a site just to save personas you use frequently to be unforgivable. I've never registered, and don't plan on it any time soon. Definitely no reason why we can't just save them to our hard drive.
The other criticism about Personas not playing nice with installed themes is also dead-on. Don't know why they can't work on better compatibility.
Overall, two stars. Nice, but problematic.