Just and update and a question/idea
Regarding my set up:
2012 15" MacBookPro 9,1 - 2.7 GHz Intel Core i7 - Memory: 16GB 1600 MHz DDR3 Corsair - Vengeance - 750GB Seagate Momentus XT Hybrid hard drive - Graphics: NVIDIA GeForce GT 650M 1024 MB - High-Resolution 1680x1050 Anti-Glare Display
My experience in the 2 weeks that I have had the 2012 MBP has been excellent. I have been doing all kinds of things to try and max it out and crash it and I have not been able to crash it or get beach balls. My overall temps when I am running the hell out of it are still consistently 20 degrees cooler than my 2011 MBP. The Corsair Vengeance RAM is operating perfectly and presenting no issues, so get it and save some money, but if you "have" to spend more and be part of the cool kid club, then get the OWC version of the RAM.