I have a Prius v+2 (EU version, so 7-seats) with sunroof, therefor no built-in glasses holder in the interior-light dome. (it's probably used for the roof's electronics) I do need a glassesholder, so I've bought one of these online and installed it. It's meant to replace the roofholder on the drivers side. Before: In between After: The installation was a breeze. Just two clicks (using the original metal clips. Removing the holder, that was a bit harder. But after finding the correct place to place the wedge, it was just a matter of pulling out the metal clips (with the cover dangling) The official "instructions":
That's pretty slick. Looks neat. I don't use mine that much, but if I wanted one? That's a neat way to add one.