I got the camera because it was a good price for what I wanted to do. I wanted to attach it to the bottom of my drone and get some aerial shots in 1080p so I already went into this without having high expectations for the 4k recording ability.
Now my main problems with this camera is the battery. The battery on this camera is a hit or miss and I think it may have something to do with the firmware or how it records to the SD card. I recorded in my car using an insignia GoPro accessory kit and selected the Car option on the camera at 1080p which flips the recording upside-down for you. It recorded a solid 45 minutes and had some battery left to spare. Then the next day after a night of charging it, I ended up doing the same thing again but this time the battery only lasted about 15 minutes. I figured buying another battery could be in order but I did more testing. While at work I charged the camera up and recorded again on my way home. I noticed the screen shut off but the red light was still blinking letting me know that it was still recording. I would assume that there could be an issue where in some cases the screen stays on while recording at times which will most likely drain the battery even quicker. I think there should be an option to keep the screen on or shut it off while recording using the button function at the top level of the UI.
The other thing that I have run into was the way the videos are stored on the SD card like I mentioned in the above. Firmware update could resolve this. When I plugged the camera in to view what I had recorded, I noticed that there were a ton of captures. It seems as though it records a bunch of separate 20-40MB recordings rather than one continuous recording. I was baffled by this a lot and was still skeptical about the way it recorded so I went ahead and recorded some more just to confirm.
This past weekend I recorded myself doing a couple upgrades to a car and in the 30 minutes that I was out there the camera battery lasted 15 minutes on a full charge (charged the battery for 2 hours) and the recording light stopped blinking. I thought that it was a fluke so I powered the camera up once again and then it immediately shut down. I plugged the camera into my laptop to review the recordings to see where it stopped at and again I was greeted to about 5-6 new separate recordings to look through for that one recording.
So, as for a solid review on this, for the price, pretty reasonable for something that records in upscale 4k. That alone makes it a good deal when it is on sale. Build quality, I cannot say that I wouldn't get mad if it were to break while I was doing something extreme but I would not buy another one for a replacement. Comes with a good amount of attachments and it is also a good thing to know that I can interchange some of the GoPro accessories to it and not have problems. File management, pretty annoying and I stress again that a firmware update can resolve this. Even cheaper action cams receive firmware updates via social networks. Just keep the recordings in 1 solid file instead of multiples for a single recording over 5 minutes long. Video is good and sound is good although I am a little iffy on the waterproof enclosure it comes with because when I had the camera mounted in my car, it sat right above the car speaker and you could hear the music crystal clear. I would hold off on going diving with the camera.
It is a good camera for anyone in the beginning stages of trying to get into action cameras. For the avid film enthusiast or professional, eeehhhhhhh you may need to lower your expectations quite a bit.