I just want to thank Apple for the update. I can confirm that my 15''MPBr issues have all been fixed by this update. Prior to update my screen would flicker like crazy some days. I never quite understood what caused it to do this. I was actually on the brink of taking it to the apple store. I just could not believe that for all this money paid, I was having all these issues. My first mbpr had to be returned because of bad screen (lg screen retention), but the replacement at first seemed perfect. All in all the only problems I had got fixed with the update: -screen flicker -fan speeds -minor glitch when waking up from sleep -seems to run smoother over all while browsing safari or just using iTunes So as my title says I give Apple credit for doing a proper update to address issues which really should have never been in the first place on a $2300+ computer. But thank god they got the screen flicker issue resolved that was beginning to really wig me out.