On the other hand, the way the magnet is attached to the air vent is basically just friction of the vent slat between the rubber bits on the back.

Bends the vent slats.

The Maggrip kept falling out of the vent slats.

In my particular case, the grippers on the back designed to clamp onto the vent slats don't always hold well

Sorry, this is not a good holder for my 2016 Volt with vertical vent slats

I had to develop a workaround to hold the vent slats in place before the MagGrip could be mounted.

This product advertises being able to hook into the vent slats in your car

I was also worried I might break a vent slat, but so far I have managed to avoid that

If your phone falls off when going over a bump, find a new slat.

It took me a few days to figure out the best placement in my vent slats because of the curve of my dash

After about 30 days or so the strength of the magnet overcomes the adhesive of the metal plate and the phone simply falls off as you are driving along leaving the metal plate securely hugging the magnet

I have used the thin plate between my iPhone case and the phone itself (unstuck) as well as on the outside of the case (Permanently) and works great either way.

I would prefer not to see the magnet on the exterior of the case, as well as, I'd prefer not to have to remove my case from my phone.

Works as it says it would.

, they work exactly as they are supposed to.