I hate laptop fans (actually all fans). I've digested all the other pros and cons. All I care about now is "is it quiet or not????" I have seen some comments that it is silent; others that the fan seems to spin up a lot. Assume that I'm working at night with no TV, no family noise. Is the fan going to more than a very quiet murmur? Looking for responses from those who actually own, not those who listened in the stores since there is a lot of ambient noise in those stores. PS also has does the MBP and regular MB stack up on this dimension?