Review on Universal Black Air Vent Car Mount for Smartphones - Koomus Pro Air by Douglas Holla

I tried it with HTC A9 and Samsung Galaxy S6 Edge. It's good for both, but doesn't offer stability for phones (especially S6 Edge). I use it with my phone in a vertical position. Over time it seems to keep tipping downwards due to the weight of the phone. The part that goes into the vent takes up quite a bit of space and bends the vents quite a bit in both of my machines. It doesn't look like it will flex enough to cause damage, but it does flex the vents. Overall it works reasonably well but isn't as stable as the Koomus CD slot version I also own.