In my opinion, Windows RT just hasn't proved its value. With the exception of the Surface (RT), I can't think of a single RT device that made me think "Oh, I want that!" I do own a Dell XPS10, but It certainly wasn't a value at its original price. I purchased this from craigslist and didn't actually make a move on one until the 64GB model I kept my eye on dropped to $280 (with keyboard). Sadly, it's a buggy affair, as Dell hasn't quite figured out how to implement the dock properly in my opinion.
Back on topic, however, while the included Office is a nice touch, the only reason the tablet works for me is my simple needs. I basically need a browser for couch and toilet surfing. My Xbox music pass is a nice touch, though not a selling point on a tablet (my phone is a different story). The app selection is still woefully lacking, but I can't complain too much at $280. I'd be very upset if I'd paid $500-600 for a device with the same restrictions (and no, I won't buy an iPad or Android tablet at that price either). At that price, I'd rather save a little more for a Surface Pro or something along that lines.