GPS Speedometer Head Up Display with OBDII Data

Very good but on the expensive side full price.

Good - It's accurate and performs well in ODB mode. Menus aren't self explanatory but it's all in the manual so goes alright. Personally didn't need the reflective sticker and some car models would be difficult to get the unit it close enough to the window (so it's not obstructing vision) - but ok in my situation. Bright enough for 90% of daytime driving. Not sure if it's quite worth $100? But I got it on a sale, 50% off and definitely happy/would recommend wholeheartedly at that price point.

Faulty

Its faulty. Display doesn't show properly on the window screen and it reads upside down. No instruction manual comes with it. You can only download the product button functions from the website. but its way over my head when the function instructions use words like "push left to increase the parameter". What on earth is a parameter. The screen protector that it comes with doesn't fit over the device. "Please kindly watch the reflection on windshield to ensure correct operation" but it doesn't display properly

Great product but needs instructions - it’s shows on your windscreen and comes with a little mirror definitely take your time setting it up

Great to avoid speeding fines!

We have two of these in our main cars, and they give us an accurate speed reading (after calibration). They help us to avoid speeding fines, as we can easily see our current speed at the bottom of the windscreen. We keep them covered when parked in the sun, so they don't overheat. Easy to calibrate too, using Google Maps as a reference speed.

Inaccurate GPS Speed

Very disappointing. I've never seen a GPS device this inaccurate. It reads 5% high in GPS mode compared to other GPS devices. It's only fractionally more accurate than my speedometer.