Pros Does exactly what it claim to do.
Very stable and grippy, Minimal vibration. And I drive on NYC's (mostly) terrible streets!
Cons The only drawback is that it requires both hands in my experience to insert/remove my smartphone. That is because the claw-like "jaws" that do the actual holding are spring-loaded -- so you have to pry them open to insert/remove your phone.
Summary But for the "con" referenced above, I would have given this product a full 5 stars.
The sticky suction-cup is very good -- I have no problem placing the device on my dash rather than on my windshield as with other devices.
I may try placing the bracket in different places on the dash to improve my ability to insert/remove my phone more easily.
The design is nice and simple too.
Overall, an elegant solution.