Evidently it does have one flaw, at least if you live in colder climates.

This does not work on my Grand Prix at all as the vents are round and the louvers themselves don't move; just the entire ball.

does not work on a 2006 toyota prius.

Difficult to put in place, does not hold very well, pulls the vent

I does fall off sometimes but overall it is a good product.

Great idea but poor engineering, does not work as described.

Works well in our vents, it is cheap, not the thickest plastic, but does the job, and great for trips where you rent cars and bring your own GPS.

holds my gps beautifully - my vent does sag with the weight but viewing angle easy to adjust and maintain.

This sort of nuisance could easily have been avoided if the seller or manufacturer had just taken two minutes to tell us which models it does (or does not) work with

Flimsy..... does not stay put on AC Vent Louvers.

Works well in our vents, it is cheap, not the thickest plastic, but does the job, and great for trips where you rent cars and bring your own GPS.

I have a Honda crv and this does not fit the vents as I expected from the product description

does work well.

This air vent mount does not fit into any vents of my Dodge Ram truck, Corvette, or BMW

But even if it does, the price is so cheap no big deal

Good design, but does not fit my vents properly.