Hi! I have the following problem. I own MBP 15 2011 ultimate. This is my first mac and with all my respect I just cannot understand how can apple call this LAPtop. This thing is so hot and noisy sometimes, that I just cannot use it on my laps. Even some minimal youtube or other 10-20% CPU intensive task drives it crazy and extremely hot to the touch. The vents are very noisy at >5000 RPM. I just cannot use it sitting on sofa or laying in bed surfing internet, email and watching videos, text editing, excel, because it is very hot and noisy. I took it to apple, and they told that temperatures are normal etc etc. I also had different models of HP dv laptop series before (all perfect with noise and thermal management!) and perfectly understand that CPU damage will not occur at 90-100C, so technically speaking my MBP is OK. I can easily change thermal interface by myself, but this does not change things drastically - as far as I understand from MBP thread my temps are quite normal and wont improve after changing thermal paste. So, the essence is: I want maximally quite and cool LAPtop and do not really care about CPU horse-power. Now I can change my MBP for MBA 2011 13. After reading this forum for a while, I understand that i5 is cooler than i7, but I want to know is it cooler and more silent than my MBP also? Can I comfortably use it on my laps and without earplugs during more intensive CPU usage, e.g. lighroom import? I do not really care about CPU temperature itself, I just care about holding it on my laps and not being as noisy as helicopter during normal, less than 20-30% cpu usage. The most intensive tasks Ill be doing are lightroom, 720p youtube and 720p and 1080p mkv videos from external storage. Thank you in advance! ps. Do not ask why did I choose MBP before , I got it from my employer for free.