I alternate between my desktop and my laptop depending if I want to spend quality time with the wife or not when I'm playing.
My laptop does get pretty warm but I bought a $20 Targus usb powered cooling pad and it seems to really help. I've never had any heat related issues with it even without the cooler but better safe than sorry. In some cases the laptop I use actually runs the game a little better since it is a little newer and has some slightly better hardware.