Dell XPS 13 ultrabook. Damn its awful. It was supposed to have a 1080p screen, while it only has a 720p (I think they now actually have 1080p screens) mine was also supposed to have a 3537u, but it only has a 3517u.
Also, the clickpad is just absolutely painful to use. You'll always misclick and the cursor will jump around randomly.. also the keyboard is impossible to type on. It just feels really awkward to use and I can never type correctly. Dell support is the worst I've ever used. I told them that the screen is supposed to be 1080p, and its only 720p.. he told me in a very thick Indian accent that theres a slider to adjust it.. Really?
Sorry for bad grammar and spelling. I'm on my phone. Ill come back later and fix it up, and add some more details.
If you're looking at an XPS 13 because its cheaper than a Zenbook, forget about it and buy the Zenbook. I regret spending $1300 on an awful laptop to save a little over the Zenbook every time I use it..