Works great. I chose it because (a) I couldn't be arsed to write a username/password setup and (b) using things like Facebook/Twitter requires an API key and I can't be bothered.

Optimizing for laziness, Persona sort of won out.

That's exactly what I was hoping to hear. I often build one-off web applications (server-side rendered, not JS-filled stuff unless its needed heh) and I hate handling the user/pass setup and flow. Cool to know that Persona will work well for that sort of thing, cheers!