When selecting an open-source framework, the proof of the pudding is in the eating. You did your research, you did a thorough review process, and one candidate stood out among the rest and offered the best solutions for your use case.
So, the framework looks great, but does it really live up to all of its promises? You must test it thoroughly before adopting it for good. You know that a "try-me" tutorial is not enough. However, performing a real test is a lot of work.