Nice hunt, friend! Here's my opinion:

Pros:

-Simple interface, easy to understand and undeniable utility.

• As its premise says, it allows you to concentrate on what you're doing. Zero notifications, zero advertising and zero distractions.
• You can modify the control of notifications and content to find out what you want to be informed about.

Con:

• You have to provide certain information from your facebook that, at least I wouldn't trust to such a little-known company.