Usage experience: less than a month
Advantages: I want to say right away that I bought the camera exclusively for diving and underwater photography. Before that, I had a lot of experience, 5 years, in underwater photography with a GoPro-4. So I will compare it to the Model IV and for underwater use. I will not write about two displays on the GoPro-9, image stabilization, horizon stabilization, etc. Only lazy people have never done that before. I write what is important to me. The first advantage is that it is now possible to turn on the camera, start shooting and turn it off using one button, which is the top button (QuikCapture mode). Experience shows that when you are under water with dry gloves (where the thickness of your finger is sometimes half the thickness of this camera) you feel the power button (on the 4th model)