Strangely, I get a server error in the browser every time I try to use this. Also, Windows (7) has taken to asking me if I want to give the browser admin privileges every time I launch.
My phone is registered using a custom domain, but I switched the account to a GMail address and ensured I was signed in using a standard Google account when installing the extension. Perhaps it's an issue with phones tied to GAFYD accounts. Is yours?
Now that it's working, it's pretty fast and effective; I look forward to seeing what else can be done with it. For example, it could be very handy for trip planning and so forth.