Quite a few of the research papers relating to a Flipped Classroom approach show results of positivity and success:
We recently surveyed the 15,000+ members of the National Center for Case Study Teaching in Science Listserv to see if the method was being used by STEM case study teachers. Two hundred case teachers reported that they teach in a flipped classroom and cited additional reasons for doing so, including the following: (8) there is more time to spend with students on authentic research; (9) students get more time working with scientific equipment that is only available in the classroom; (10) students who miss class for debate/sports/etc. can watch the lectures while on the road; (11) the method "promotes thinking inside and outside of the classroom"; (12) students are more actively involved in the learning process; and (13) they also really like it
Emphasis Mine
and another:
Conclusion. Implementing a flipped classroom model to teach a renal pharmacotherapy module resulted in improved student performance and favorable student perceptions about the instructional approach. Some of the factors that may have contributed to students’ improved scores included: student mediated contact with the course material prior to classes, benchmark and formative assessments administered during the module, and the interactive class activities.
The common trend so far is that students are more engaged in the topic and their perception of the curriculum is much better.
As class attendance, students’ learning, and the perceived value of this model all increased following participation in the flipped classroom, the authors conclude that this approach warrants careful consideration as educators aim to enhance learning, improve outcomes, and fully equip students to address 21st-century health care needs.
While all the feedback so far seems positive, there's a common trend here: They're university students.
For university students, this seems like a good strategy, chances are they watch lectures online and study heavily in their spare time anyway.
However, for primary or secondary students, this isn't necessarily their style.
When I was a kid, I can remember avoiding homework like the black plague.
Trying to teaching the core of someone's studies in an environment where they avoid it? That really wouldn't work.
From a parent's point of view, it's also a big strain on family schedules, and a lot of responsibility on the child.