I am changing over to mac and had previously decided on a 13" but my town recently opened a leading edge that is a apple reseller so I was able to go in and see the macs for myself. After this I realised the 13" is far too small for doing any photo editing and graphic design with cs5 etc. So I've decided on the 15" with i5 processor. I read lots of reviews on it and a lot of people said they had over heating issues. The reason I'm changing to mac is because my current pc laptop has over heating issues and just is crap in general. I don't want to spend A$2200 on a laptop that is said to be reliable, but end up having to replace it or repair it down the line because of damage caused by over heating. My question is, are the those complaining about a 70 - 90 degrees C over reacting or is it normal for the MBP to heat up this much? I won't be using it on my lap or in bed, it'll be on a desk where ever I go so I'm not worried about it being uncomfortably hot. My current pc runs around 50 degrees C during general use so I don't understand why 70+ would be so high for extensive use. If the MBP was over heating wouldn't it just switch it's self off, meaning if it's not doing this then it's not geting TOO hot, but just hotter than you expected?