If you can touch the roof with your hair and the rearview mirror is directly at eye level as you sit... you might appreciate this.
Also if it's not your daily driver, auto-dimming lights, auto-dimming mirror, and the compass might not be missed.

Hole in the middle is to preserve the OEM plug so easily reversible. I'll probably to the little 'clamp' pieces a little when I get around to it, but I'm happy enough with the look, and makes a big difference with visibility.