It's really not as difficult to install as other users would make out. You insert the SD card, it pops up with the option to format, you select it and it's done. The rest is intuitive. I didn't even read the manual.
I used it for the first time today. The picture is clear, the angle is wide enough to capture the whole road and it works as described. The great combination comes with rear camera setup, which is also easy to install. Overall a good deal.