It integrates with OS X notification center and the 'Do Not Disturb' mode allows you to stay focused.
Apple Mail like keyboard shortcuts, acting as default Mail Client, Mail PDF from Print Dialog, OS X Services, and much more. No separate calendar set-up required and accepting an invitation intuitively switches to the correct calendar tab.
Download Mailplane and you can try it 15 days for free. Love Gmail? Mailplane makes it even better.
