This was installed where a medicine cabinet hadn't existed before which required opening up a rectangle in the Sheetrock between the studs.  A cabinet that was an "oomph" wider would've been nice because the studs were a little farther apart than the width of the cabinet.  I was able to use slices of the removed Sheetrock as filler on the sides so it wasn't a big deal.

Be careful when tightening the mounting screws.  Should the screwdriver slip off the screw's head, you can nick the paint.  Ask me how I know.  I just used some white touch-up paint I had that was close enough to the same color.  With the cabinet loaded up with stuff, I'm likely the only one to know the paint is nicked.

Pros: Arrived on time and undamaged.  Looks nice, fairly easy installation.
Cons: A third shelf would be nice.