So I recently required a complete change in my computing requirements and was able to consolidate into a single machine from a 2010 27" iMac and a 2012 13" MBA. Suffice to say that I wouldn't be traveling as much as used to and the iMac was not getting any use. I ordered a CTO early 2013 15" rMBP specced with 2.4 GHz i7, 16GB RAM, 764 GB SSD. It arrived today after a 10 day wait. I am blown away by the quality of this machine and especially the screen. (I was lucky that I got a a Samsung Screen and Samsung SSD). It's hard to explain the effect the screen has in terms of reducing the strain on the eyes. The overall build quality and speed of the machine is just ridiculous and it weighs less then the 13" cMBP. But the screen, oh the screen!..... I have been ruined for the rest of my life! If anyone is thinking of jumping on the bandwagon, I suggest diving in head first! You won't regret it.