I use it a lot

Lots of control over the camera. Watch app hasnt worked for me yet. But this app meets my needs. Even if you dont end up using it, its worth having and playing with so you are aware of what it can do with the camera, if you are using the iPhone as a serious camera.
I have been using the iPhone 6s Plus camera as a semi-serious video camera for a little while now and this helps not only control the focus and resolution exactly how I need it for the current shoot, but it also keeps this stuff separate from my normal camera roll. Interface has a small learning curv, but I prefer that to the oversimplified stock photos app (which has its use as a simple and quick point and shoot app). Plus, you just *feel* like a pro when going through the toggles.

JermJus about Filmic Pro－Video Camera