Honestly, after buying a truck with the digital mirror I wouldn't recommend going through the trouble and cost of adding it. It's more of a novelty for me than something that's actually useful. The only time I would actually use it is if my rear window is blocked and I'm not able to use the conventional mirror. People who ride with me think it's cool though LOL. I'll list my pros and cons about it. These are my observations, your observations may differ.
Pros:
Allows better visibility when conventional mirror view is obstructed.
I'm not staring at rear passengers whenever I check the mirror.
Cons:
The resolution is decent, but nothing is as good as an actual mirror (full-definition).
Details are difficult to make out while driving.
Image in digital mirror appears a little further away than in conventional mirror.
Need to change focal point when moving my eyes from the road in front to the digital display (mirror).
Takes a while to get used to using it.
None of the truck is visible in the image so there is no point of reference.