I bought the camera for use in windsurfing, for simple shots with minimal contact with water. Unfortunately, the third time I tried it, the camera got wet while it was inside its case. As a result, it soon stopped turning on and went out of warranty. Also, the first time I put it on the motorcycle, I narrowly avoided the wind taking it away due to the mount.

Regarding the video, from the minimal use I gave it, it was relatively good, as well as the sound. The stabilizer is good but it cuts a lot from the wide-angle shots. At night, as expected, the quality is poor.

The conclusion is that if you want a truly action camera, pay attention to its durability and the quality of the mounts, and then the quality of the video.

I have bought it for the camera. For this price (100€), I don't think I could find anything better. The stabilization is quite good. For night shots, you need to select the night mode option from the menu to capture correctly. It is actually enabled by default and it recognizes darkness on its own and performs perfectly (considering its price).
I have taken it on summer trips, vacations, etc., covering almost 2000 kilometers, with good speeds, and it hasn't presented any issues.
For the price I bought it (100€), it is definitely worth it and even more compared to other cameras in the same price range. It does it all, it even has a microphone input and comes with many extras. The battery is good, but it is advisable to buy a second one as a backup.

I did not expect such a small camera to do so much. The front and back screens are touch and have endless settings to capture any video you want. It doesn't freeze, even with a lot of vibrations (motorcycle). It doesn't understand anything, especially if you put the gyro on high. The sound is very good. Now, for night shots, if there is sufficient lighting, it captures well. I took shots with the lights of the highway and the lights of the motorcycle, and I can say that it is above average

It has its issues, such as the sound quality when it is inside the shell, the quality of night shooting & photography.
For its price (89.00€), I considered it a fair solution (VfM), since I couldn't afford something better.
4K video, just forget about it.