Default [Q] Charger question

OK, so I picked up a charger that should have worked with our tabs; http://www.amazon.com/gp/product/B00...00_i00_details.

It's a 2.1amp USB charger, pretty much as same as our stock chargers, though marketed for the iPad. I wanted to get it because I so dislike how the stock charger wobbles so much when you plug it in, since you have the area around the base of the plugs raised up from the rest of the charger; it can't really lay flat against the outlet. That, and the fact that it has folding plugs, making it easier to toss in my bag (why did Samsung design something as clean and attractive as the 10.1/8.9 tabs, then give it an ugly and unsteady charger?) It looked like a perfect solution.

Only it charges no faster than it does from a regular USB port (if you have a kernal capable of supporting USB charging). Surfing the web will eat up power faster than you can charge. It charges my SGS2 just fine, though, pretty quickly I might add. Is there a different pinout with the stock charger?
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Samsung Galaxy S3 i747

Samsung Galaxy 8.9 Tab

Google Nexus 7, rooted stock