The first surprise was just shoddy electrical engineering: unlike any camera from a big-name manufacturer, they drain the batteries in storage, to the point where they're dead after 2-3 weeks. But that aside, image quality is just poor for the price. It's oversharpened and oversaturated to cover up deficiencies, and that may work for some YouTube videos, but it's a $400 device that's miles behind any $500 mirrorless.
So I get it that if really want to go snorkeling or mountain biking with a camera, this might be a good choice, but that's a tiny market, and for everything else, why would you buy it? If you want cell phone quality video, you can use your cell phone. If you want professional quality, you can spend the same amount of money on a mirrorless from Canon, Panasonic, Sony, or whatever.