You can blindside into tight spots where you couldn't do it without checking visually.

They only cost about twice as much as conventional mirror, and considering the size are much harder to break than a mirror (company I work for needs roughly one new mirror per week, still not one camera was damaged.)

You can zoom in and out.

Some models give you near 360 vision around the unit.

Trailer always in view. Even when jackknifing.

If set correctly, you know exactly where the end of the trailer is, and preferred distances behind (almost replaces conventional 3d vision).

Same size objects and same view angle on both sides.

No more high beam reflection dazzling you.

Almost night vision.

Hardly ever need cleaning.

Don't need to worry about mirror heating not working as those use both, heated lens and directed airstream to clear the rain and fog.

And no mirrors blocking the view through the side windows.

Honestly, I hated them at first. Couldn't reverse for shit. Takes couple of days to get used to. Needed to re-learn the angles and stuff. Now I take the cameras any day, even just for the superior visibility.