I purchased this mounting bracket for the obvious reason - to mount my tablet in a convenient location in my car so that I safely and conveniently use the navigation and music player functions of my tablet. I have a 54 mile commute each way every day, and this is far safer than steering with your knees and looking down. The tablet now sits in arms reach and only a few degrees of viewing angle away from the forward direction.
Pros - Holds your tablet at a convenient angle so you can keep 1+ hands on the wheel. Bolts to the seat bracket - no need to drill holes in your car. Spring loaded clamping mechanism truly fits any device in or out of a case. Extra brackets are included for alternate mounting scenarios, and additional clamp faces are included for smaller tablets. Extra cable included to extend the reach of your charger adapter.
Cons - The long shaft means that it will wobble considerably, making it hard to focus. The manufacturer should consider including a strap of some kind to connect to the clamp to brace it and eliminate vibration. (I made my own.)
Other Thoughts - This really is the only product I've seen on the market suitable for vehicle mounting tablets, so really you can't go wrong. The manufacturer put sufficient thought into this, but there is room for improvement. A back-strap to dampen vibration would be a good idea. If they could integrate a USB pass through cable into the shaft for charging,it would clean the look up considerably.