There isn't much I can add to other reviews that hasn't already been said but I also would like to confirm the quality and reliability of this product.
Out of the box you get a docking [toast rack style] charger, a USB lead and 2 batteries. You can leave it plugged into you Xbox or buy a USB plug to put it straight into the mains.
Replace your controller batteries with these batteries and put on the dock, you can charge one when playing with other or charge between games but at only 1.5ish hours for full charge you can afford to decide.
The charger looks very stylish, especially with controllers sitting on it. The charger has 2 lights on the front [left for front controller, right for back] and they are red until fully charged which then turn to green which I found was a problem with other chargers I've had, they didn't let you know when they were complete.
Overall I think for the price, looks and reliability of the product you couldn't ask for any better.