-Does it's intended job: Extends the battery of your WiiU Game Pad, allowing for longer play sessions.
-Although I haven't needed to, it has a tiny button on the back in case you need to Resync. It's situated that it's hard to press accidentally during play, but easy to press if you need to (a small object like a toothpick or paperclip.)
-Does not use a separate charger, it can use the standard WiiU Gamepad Docking Station or Charging Cable. It also will charge the Gamepad as well when plugged in.
-Due to being an external battery pack, it can be combined with a higher-capacity battery for even longer gaming sessions.
-Has a slide-out stand on the back so that you can place the Gamepad on a flat surface and see the screen.
-It may get a little warm during usage, unsure if it's just mine or common.
-The instructions could stand to describe the product a bit more.
-It adds some weight to the Gamepad. This wasn't an issue for anyone in my family, but it may bother some people.
-When your internal battery starts to run low, you need to activate the battery pack manually. It will show a orange light and start charging the Gamepad.
-The slide-out stand on the back doesn't fall loose nor does it slide around when you have it set up. On the flipside, it takes a little effort to pull the slide out, and is somewhat noisy.