I got one of these after I had gift cards thrown at me during the holidays (for $500) and I feel that it's absolutely worth it, even at that price.
I bought the Microsoft Surface pen to use with this (Wacom makes basically all of the pens in the new pen enabled tablets, so they're mostly cross-compatible), and it works brilliantly as a note-taking device. Again, Wacom is behind the pen technology, and the tablet is largely up to snuff with regard to pen support - it's a bit iffy on the edges, but overall very good, with the kind of pressure-sensitivity that I've come to expect in a Wacom pen device. I draw on this with SAI and the experience is up there with the Intuos3 I use on my workstation at home, and it is an excellent device for writing notes in class, working flawlessly with Windows Journal and OneNote.
Otherwise, you get a few frames dropped with 1080p playback at times, but all 720p videos that I throw at it playback fine, and it works just about as well as you'd expect from a 2013 Atom device. For $400 I think this is an absolute bargain - My $300 netbook running an AMD E-450 APU (Hecate), which this tablet replaced, is basically the same in terms of overall performance. The main selling point of this is the pen and touch support and the thin form factor (It's thin and quite light in comparison to netbooks and a bit lighter than most 'ultrabooks'). I've had it freeze up once during use, but a quick reset fixed that and otherwise I've not had many problems with anything over the past 6 months of every day use, so I'm willing to dismiss that as a fluke. Also be warned that Bluestacks does not perform very well, but I really don't care for Android tablet apps anyway so it wasn't really a big deal. Fruit Ninja piddled along at maybe half the performance I'd get out of a proper android device, for example.
Of course, if you're not one to care about form factor and pen support, then by all means grab a cheap netbook instead and save some money. However, in my personal experience as a student who takes a lot of written notes, does digital art, and does not demand much out of his mobile devices (I save stuff like intensive gaming and CAD for my desktop workstation, for exmaple), this thing has been an absolute joy to use.
A few examples of what I've done on this device:
Math Notes: https://www.dropbox.com/s/r3yc2qp37ao4w7i/calc%20review.pdf
A sketch: http://i.imgur.com/9NhmXlX.png
A quick painting: https://www.dropbox.com/s/ik4g9hm8o11kuxo/rnd1.jpg