We bought one. I have mixed feelings about it. The new Wii U controller and the touch screen feels like more of a novelty than a useful/lasting gameplay dynamic. It kind of feels more distracting than immersive at this point.

Part of the reason for the slow sales may be that there are virtually no games out for it yet. There are several coming out starting in March, so it may be interesting to see what sales numbers are like, then.

Also Nintendo isn't launching with a new Legend of Zelda game to accompany the new console this time. I guess the Gamecube didn't have Windwaker until about a year later, but Ocarina of Time launched with the N64 and Twilight Princess with the Wii. The Zelda franchise alone seems to boost console sales a fair bit (which is pretty telling in its own right).