Problematic

I bought the complete version of the app, but it is worthless. It is not well integrated with the notifications on Mavericks, so it pops up its own notifications, but doesn’t stick to the system’s menu.
Also, sometimes when you first open it, it will not show your e-mails, keeping just a blank background visible. Then, if you change it to the desktop version and back again to the mobile one, it decides to show your e-mails.
It needs lots of improvements before starting to charge its users.

J D Salinger about App for Gmail, v1.0