I like that we can see our overall performance from week-to-week as well across all of my different channels (Facebook Advertising/Audience Network).
It's not fully integrated with Google AdWords so it would be useful if you could pull data directly through GA instead but otherwise great! We are able to easily track conversions between ad groups within an account without having separate accounts or running multiple campaigns at once which is helpful when looking back over previous months worths work - especially since some platforms have limited access depending upon how long ago they were created etc..