I was wondering how easy the fans run on the SR MBP. I plan on getting a new one in 1-2 weeks and I have heard people saying they get really hot. Things/projects I do at home I dont really care. But when I use it at school and it is sitting on my lap, how easy do the fans turn on in that thing. If if it matters... 2.4, 4BG, 7200 RPM Thanks.