I'm very happy with my Asus UX305F. I have Linux installed, everything except brightness keys works perfectly. Great build quality, mate screen, battery lasts very long. And it was cheaper than most of what people mention here. For CPU intense task, I just use my desktop.
I also own one and can second all you say about it. The only problem is the lack of a backlit keyboard, which might be a show stopper for some people. Other than that it's a very good machine, at a very good price and installing Linux (at least ubuntu, from my experience) is absolutely painless.
