The app offers really advanced features that seasoned marketers will certainly enjoy. You can basically do whatever you want with the FB pixel. Nevertheless, in my opinion, the UI is not very intuitive and requieres a long learning curve. The documentation is abundant but not always updated, and again it's not organized enough and has a lack of hierarchy. Learning to use this app will require quite a lot of your time and maybe you'll feel some frustration trying to find the video that explains what you exactly want to do. The good point is that once you understand how to use it... The possibilities are almost limitless.
I would like to suggest the the creator to improve the UI/UX (maybe hiring an external consultant?) and also to try to update, tidy and organize the documentation. With this improvements, IMO, it would be a 10/10 app.