Hi, I have a 13" MBP (2010), where I've replaced the primary HDD with a SSD. For work the noise level is basically non-existing. The only time the fan starts spinning is if I'm running some heavy cpu intensive process over a longer period of time or when I run games on it. I've been thinking about upgrading to one of the new 15" models, but I was wondering how their noise level compares to my existing machine. Seeing the beefier specs, I would assume that the fans are sometimes spinning even while not being under heavy load? Any feedback on the noise output from the new models would be appreciated.