Hi hefs, at the moment I am using a laptop as my main system, Before I had my cooling pad there was no way I could leave it on, it got so hot you could have fried an egg on it...literaly. When I poped the fan panel underneath it always stayed cool, I dont leave mine on 24/7 but a few nights out of the week I will leave it on, all night for downloads and never have any problems.
I do think that a cooling pad helps the laptop out a lot. Hope this has given you a little insite from someone thinking the same as you
peace.