Great for hiding your inbox (thus: avoid distraction) while still being able to compose emails, search emails, etc. I use it in addition to the Inbox Pause feature of Baydin which even prevents new emails from arriving until the set time of the day. These two together make sure I can always access Gmail but I only see my actuall inbox and new emails when I planned to do it.
In summary: I control my Inbox, and my Inbox does not control me.