I'm very picky when it comes to managing my phone at home, the office and on the go and have owned several windshield mounts through the years. However I have to say switching from the clamp mounts to a magnetic system is definitely the way to go and this window mount from Naztech is a home run.
The suction cup attached to the windshield is very strong and doesn't vibrate when you drive or hit rough roads or the occasional pothole. Be careful of the mounts that have many adjustment hinges - these can work their way loose and your phone will be vibrating and bouncing as you drive. The beauty of this Naztech device is the simple engineering of the product with an articulating ball joint located right behind the magnetic plate that you can adjust and tighten when you get it to your preferred spot. Otherwise the "arm" of the device is one piece of plastic that keeps your device in place as intended.
Before switching to a magnet system I was concerned of my 5.5" mobile device would detach from the magnet - this would be an absolute deal breaker. After using the magnet system for several months I can tell you my device isn't going anywhere and hasn't dislodged once when attached to the magnet, it really is that strong.
Good luck with your search and if you're picky like me this is an important decision to protect your very expensive phone. I highly recommend giving the magnet system a shot and this particular model from Naztech is the best I've found.
Naztech MagBuddy Window Universal Magnetic Car Phone Windshield Mount, Fully Adjustable Holder with Insta-Lock Technology for iPhone and Android Mobiles, Smartphones, Cell Phones, Tablets and GPS