Installed this unit in a 2014 Ford F150 SuperCab with a standard 6.5' bed.

THE GOOD
The cords were long enough - but only just long enough. If this had been an 8-foot bed or a supercrew cab I don't think the wires would have been long enough.
The video display does not show through the mirror *at all*. I can't see the display or even know it's there until I put the vehicle into reverse.
The mirror/display is just slightly larger than the stock F150 mirror and it seems to secure well.
I was able to find a great spot for the camera between the bumper and the tailgate. There's just enough room for it to be there and not interfere with the tailgate. In this spot it's well protected and reasonably hidden.
The price was right ($29.99) and reasonable for what I received.

THE NOT GOOD
The wires are *crazy thin*. I tinned them before soldering but this didn't bulk them up too much. I expect the failure of this system will be the result of wire failure ultimately.
The mirror has no dimming functionality.
The mirror is not as "bright" as the stock mirror in the vehicle - it's a little darker or a little blue. Nothing I don't think I'll get used to, but it's noticeable.
The only way to rotate the display is to unscrew the lens cover, rotate the entire camera in the bracket, and then screw the lens cover back on.
The guide lines do not move and are not adjustable in any way.
The alignment of the camera is cock eyed. To have it display directly behind the vehicle I have to aim to off to the right side. Not the end of the world, but suggestive of poor QC.
The instructions were in Chinglish. I was able to get through them, but it took a couple of reads to figure out what was meant. For example, "Prior" means "Priority".
The minimal display controls can't be accessed without removing the mirror/display from the vehicle's stock mirror. Don't expect to spend a lot of time customizing the tint, brightness, saturation, etc. because of this.
The display *may* be a little dim. I've boosted the brightness but have not yet been able to get a good feel for how beneficial this is.

THE RUB
Assuming I find utility in this unit, I'll use it until it breaks and then replace it with one that's of higher quality (better mirror/display, better cables,perhaps more functionality, etc.). If I don't find utility in the unit then I'm only out $30.

Excellent quality for its price. Rear view mirror screen saves from having to find a place to put a lcd screen somewhere in the dash.

Pretty fuzzy on the screen.

Updated to 5 Star from 1 Star - The seller has been very responsive and sent the instruction promptly and longer cable. The camera and video quality is good.

I received the packet today and looked at the installation instructions. Was surprised to see letter from seller that we are making better instructions. I looked up few YouTube videos and started the installation. I couldn't complete the installation as the video and power cable length is short to complete installation on Honda Odyssey Van

Great rear mirror, and great price! My wife is loving it.