Hey guys, about 6 months ago I bought a second hand rMBP 2012 (base model 8gb; 256 storage), because I did not have the money to buy a new one. Since the moment I got it I used to love my MacBook but I was constantly irritated by the lag/slowdown caused by the inability of HD 4000 to handle the retina display (especially now that Yosemite is out). Furthermore I know that Apple usually means quality but I bought my MBP without warranty so that is also a concern. Now that I have the money I am considering buying a new rMBP (with education pricing) and selling my old one, hoping that the difference would be no more than 300£. That would solve the warranty and ui issues (i hope). Do you think it's worth it?