Let me start off by saying I want a rMBP. But, there have been problems. Most sound ok. However, lag on them seems to be a problem. And while I understand that software can fix it, apple seems to be slow with fixing stuff like this. I remember an older graphics problem that was around for quite a while. Lines on the screen if I remember correctly? Or maybe it was blocking? I don't know. But will lag be remedied soon? I had heard 10.9 would be the fix, but still some say they are experiencing the lag with it. I just don't want a 2,200 dollar machine that lags with basic use. Convince me if I should get it or not?