This daytime pic is with no reflector. You can see a double image because of the 2 layers of glass. It doesn't appear this bad from my seating position.

This pic is daytime with a reflector. Note the double image is gone. The reflector was a used one, I just used it to demonstrate the difference in brightness, it was not securely attached so there is distortion in the pic.

 

How accurate has it been? For that price, it's hard to say no!

 

Below 50 km/h it's right on. At 80 km/h it's 2 km/h high. The most I've seen is 3 km/h high.
This one only needs a USB power connection and because it uses GPS it doesn't need a OBDii connection.
There is enough USB cable with it to across the lower windshield, down the door post, across under the dash, to the power outlet socket. I used a 12 volt charger because the Kona doesn't have USB type A connection. Could use a USB A to USB C adapter. Or a long USB C to USB C cable and use the Kona USB port.
Power is removed from the power outlet when the Kona is shut off so no fear of the HUD draining the battery.

The old OBDii HUD unit worked in all my other cars but would kill the battery if the Kona wasn't driven for 3 days. An insurance dongle killed battery in same way too.
The insurance dongle techs said the Kona was not putting the dongle to sleep, it wasn't getting the engine is off data from the OBDii port so it stayed awake at full power all the time.
Sadly, Hyundai is not interested in listening to customers.
Some pics
Across windshield

Down door post, cable tucked under the rubber trim

Under dash to console

To power outlet

 

You should see the dashboards of Chinese electric cars. The whole thing is active GPS and advertising as you approach and drive past. BYD is a popular brand that would do well in the USA if they manufactured here. That would be a new transfer of technology from China to the USA. They are very innovative.

 

Nope - no ads please...

 

You don't want 50% off egg foo young at China Garden when you are 2 blocks away?

 

Not advertised to me by the car. I have successfully removed most of the advertising from my life - and life is much better for it.

 

i was sort of interested then saw these https://www.aliexpress.us/item/3256...lBottomMoreOtherSeller|query_from:|x_object_id:1005008267762205|_p_origin_prod:


try those and post lol