So, this is my first Mac laptop since '91 so I don't have a large frame of reference, so, that being said, my 17 incher has been on for about 4 hours. I have been installing Final Cut Studio for the last 90 minutes and this thing is HOT! It's been working pretty hard installing this software and I still have 45 minutes to go, but I hope this isn't how it's going to be every time it's on for longer than a couple hours. It's VERy quiet though! I don't even hear a fan (maybe that's why it's so hot - they forgot my fan!). The whole thing is hot (well, not the monitor). Anyway, I'll let you know if it's this hot with just some average use.... Pretty cool computer though!