I have been using Blackvue brand for at least 10 years with no issues other than one corrupted SD card, which the unit verbally announces if there is an issue with recording. Basically, a "set and forget" just for insurance purposes. You can change settings, but a decent size memory card will record about 8 hours worth at 5 minute individual files on loop recording. Hard knocks will trigger it to automatically lock a file. GPS data including speed overlays can be turned on for all recordings.
I was initially drawn to the Blackvue because they were one of the few that had a capacitor instead of a battery, which was the better option for Texas heat. Basically, just enough power if the car battery is lost to save a recording and shut down so there will be no corrupt files.
I have (thankfully) not needed it for any of my own insurance claims, but I have provided it for several that I have witnessed. One was a Chevrolet Silverado driver that rear ended stopped traffic at about 40mph. I was parked in the turn lane going the opposite direction. I of course put my name down as a witness and told the two cars that were rear-ended that I had a dashcam which I ended up providing to them upon request. The Silverado's insurance company called me later and asked "...and what was it that you ALLEGEDLY witnessed, sir". I got to reply with "oh, I didn't see anything, I didn't even know a wreck happened until I located what the noise that I heard was. But, my camera saw it all, including your client's cell phone fly out of his hand when he hit the car in front of him." I got an "oh, okay... thank you for your time."
Anyway, I highly recommend having one. All of my 4 wheel vehicles have front only (motorcycle has front and back), the front is pretty conclusive that you were rear-ended but of course will not show any information for the vehicle that hit you. I have found that almost all vehicles have power to the light/overhead console/garage door opener, I don't even bother running a dedicated wire to the fuse box anymore. My wife's Highlander has the sunroof, so I just tee into a "power on with key" wire in there. Makes it like a 3 foot run and I can use the exiting plastics for the mirror wiring on the windshield for a nice clean install. Generally I put the camera mostly hidden behind the rear view mirror, we don't even think about it unless we need to review recordings.
Lastly, pulling a video can either be accomplished by connecting via wifi to the unit itself through an APP, or how I do it, pull the SD card and plug it into a computer. If you pull it through your PC you do lose the overhead map view that the app provides.
This is the newest version of what I am using:
Good luck with your choice!
Ryan