I received this product in exchange for an honest review. I went through many dashcams and returned a fair amount of them, Please google for "marc merlins org dashcam testing" just to confirm that I'm not a fake reviewer :)
This camera looks similar in package as an AUSDOM HD A261, but it offers much better video quality. The Ausdom offers up to 1080p in WDR (multi exposure frames to get perfect lighting and contrast, like HDR on your phone or camera), while this camera offers WDR up to 1440p.
The only downside is that GPS is extra on this camera while it was built in with the Ausdom.

But I'll be honest, outside of tracking speed (which will probably work against me more than help me :) ), I don't really need the GPS anyway. The other small downside was the mounting hardware made it a bit harder to put the camera very close to my windshield, but that's a very minor point and you may not even notice. On the plus side, one of the mounting options has room for a filter, so you could add an ND filter if you wish (including making your own if you want to save money).
Another thing to note is that because GPS is not built in, there is a USB power looking plug that is for the GPS and if you mistakenly plug the USB power cable into it, you'll be wondering why the camera isn't working.

In addition to the superior video quality at 1440p WDR, the feature I really like is the option of either having a timelapse or having the camera detect movement and record just those bits when the car is parked. I have several cameras that claim to do this, but this one actually works! You do need some kind of hot wire kit to power the camera when the car is turned off, but in my case I have an ODB2 to USB cable that provides enough power for the camera to work when my car is off (this also means the camera does not use much power, which is good).

My reference camera in quality so far was the Wheel Witness HD Pro and this camera beats it both in quality and resolution, which being smaller (I like big screens but most people prefer a smaller camera that doesn't take too much space on your windshield).
My last Vico camera I tested, the Vico Marcus 5, also had good dual 1080p video, but it was quite big and the mounting hardware was really inconvenient and the camera felt too expensive compared to competition. This Opia2 is also priced higher than the competition, but in this case I feel like it's actually worth the extra money. Both the WDR at 1440p and the working parking function make this camera worth the extra money in my opinion, although it would be nice to include the GPS for that price.

Another thing I need to mention is the super wide picture, which is a great feature (too many dashcams have a lens that is too narrow). The picture gets distorded a bit as a result, but for dashcam use it doesn't matter at all and I'll take the wide view any day. The best part is that the picture is very sharp on the sides too, so you can capture plates of cars on your side as you pass them.

On the software side, I didn't test the software since I usually on put the microsd card in my laptop to retrieve videos, but I'll note that like a prior vico product I tried, the filenames do not include the date, they are just named "VICO0018.MP4" while other cameras encode the exact date and time in the filename (which is the right thing to do in my opinion).

So if you value video quality and are willing to pay a premium, this is worth 4.5 stars, but since partial stars are not allowed, it's closer to 5 stars than 4 in my opinion.
If you care about saving money and want GPS built in, there are cheaper options if you're willing to compromise on video quality.