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My video mirrors are about 3 years old, and the main challenge I have had is the camera longevity and the monitors dealing with heat. I now have LED backlit 7" monitors and they are much better than the first set which ran hot, and they get dimmer and dimmer as they heated up. The glare and loss of contrast in direct sunlight and the heat made them very hard to use.
The other issue is having a camera lens that is *too* wide angle. This adds a lot of barrel distortion and shrinks objects, so they look farther away than they are. I can deal with a camera with 100-120 degrees of view, but more than that is a problem, and less would be great, but you probably cannot find one with say 90 degrees or less. Having the camera be 4:3 image with the 16:10 screens actually helps "re-expand" the horizontal size of other vehicles.
Wiring needs to be robust. The cameras I have used all have power wires that are concentric rather than paired wires, so pinching them can cause a short. I had this blow the clutch cutoff switch fuse, so I could not start my car... So routing of wires is important, and relieving stress when the wires are bent (say at the door) is also important to consider.
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