I also received the Samsung S2 tablet and the Ram mount system for the 4runner. Very happy with both. Got a great deal on the tablet refurbed on Ebay and it looks and performs brand new.
The mount seems extremely high quality and really stable. The 6in arm will get it closer to the driver seat and also able to move out of the way if needed.
I got in the dual USB socket, but did some research and found the company also makes a 4.8 amp designed for phones and tablets. Opposed to the 2.1 amp, I decided to go that way. I'll be using it to constantly charge the tablet and Garmin GLO, so want to make sure it can keep up