I've never been much of a mac person, but I happened to be in the market for a 15" laptop right when these came out, and I got one (2.6 Ghz, 512 Gb SSD, 16 Gb ram). It is certainly not the best bang-for-buck in terms of raw hardware, but the combination of great screen, performance, and portability happened to be exactly what I was looking for in a laptop.
Also, I'd like to point out that the native resolution without any scaling can be enabled by using softwares called Retina DislpayMenu or SwitchResX. I've been using it set at the full 2880 x 1800 since I got the laptop, without any scaling, and text is completely readable. Using the full resolution makes it far more useful as a desktop replacement for me, as it actually has more desktop real estate than my desktop's 3 monitor setup does.