http://www.theverge.com/2012/11/18/3...o-wii-u-review

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You should buy the Deluxe Edition, if you can find it: the actual available storage in the Basic Edition is less than 4GB. If you do get the cheaper model, you can plug an external hard drive into a USB port and get up to 2TB more storage if you need it, but the drive will be specifically formatted for the Wii U and won’t work anywhere else. Plus, games can’t be run from an external drive, so again — the Deluxe Edition is the way to go.
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The build quality is one of many sacrifices Nintendo seems to make in the name of creating a lighter, smaller GamePad. Most tradeoffs I could live with, but not the battery, which insisted on dying after only about three hours of gameplay. I had to have the GamePad's charger, which includes yet another huge brick, accessible at all times when I was playing, because as you'll see there's basically no Wii U without the GamePad.
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It's a disaster of a touchscreen, though: the resistive display often doesn't register taps or swipes at all, and you have to really mash on the screen to get it to register. Gaming's all about fast-twitch reactions, and you'll miss a lot while trying to tap the screen. The included stylus is a little better, but not much.