I have an early 2011 MBP i7 with 4GB ram. I fancy upgrading it and can get 8GB ram for £43. Also see I can get 16GB ram for £73. Officially Apple only say the MBP supports 8GB but I have heard some people have 16GB running. Has anyone got the same mac and had 16GB running? Any advice if I should go 8GB or 16GB?