I go to a top 15 university as a Computer Science undergrad. I'd consider myself competent at programming.
My professor is forcing us to use this framework for our software dev class. We're tearing our hair out over how frustrating this framework is to debug (no line numbers, heisenbugs and/or things not working with no error messages, etc.).
You may have seen me posting in threads on this forum trying to answer year-old support questions. I'm doing this to help the next unfortunate souls who have to take this class. Some questions (which are top results on Google) have no support from the AppGyver team at all.
Every CS student in my university who has taken this class (and by extension all their CS friends) have nothing positive to say about this framework. All I can say is just remember that while you're working on Composer 2, the name AppGyver is developing a serious negative reputation in our school's CS department.
Sorry to be harsh, but from the perspective of a college student, that's the truth.