Bought a 2012 rmbp 16gb 512gb ssd.. Used it for 3 months... Couldn't stand the lag with everything that was being done with the a computer..l I mean correct me if I'm wrong but isn't 16gb enough ram for rmbp to work flawlessly.. I mean Jesus, it's just terrible what you pay for and what you get. A 3K laptop shouldn't work worse than a 15" umbp.