Hi guys, Just to give you a feedback. Under DP4 i had tons of problems like black screen, sleep not working and 5 to 8 kernel panic everyday. I updated from DP4 to GM and some of those problems were persistants. I had to format and clean install GM. General feedback: ML is laggy with the integrated graphics, smooth with the nVidia. No PowerNap available, probably waiting on a FW update. General usage is good, i HIGHLY recommend you to clean install if you have a MBPr.