I whent in similar thought I wanted a gaming laptop, to use as an extra gaming computer at home, or bring to friends or parents place when stayin there.
I whent in disbeliafe that gaming on laptop doesnt work it never did in the past, they get too hot, and has bad performance, right? Wrong!
I got totaly blown away over how well this laptop performed for the price I payed when I got it. It almost performs as well as my desktop gaming computer at home, runs almost every game maxed and it doesnt even get warm thanks to that excelent cooling system they made.
I bought the ASUS G73j(predesessor to that one with Core i5 and Radeon 5870).
But ye it aint a laptop you use with battery, they just dont have a battery life at all. its a more mobile gaming rig you can easily bring with you and just plug in at any place.
For lighter stuff like a more mobile device you can type stuff on and browse the web I bought an ASUS Transformer. Cant beat that 16 hour battery time. a gaming laptop prolly have 2-4 hours battery at most depending on what you do but I never intended to run mine on the battery.
But ye Im really happy I bought it, fits my purposes perfect, it runs WoW and SC2 all graphics maxed np, it never gets warm, its way easier to bring to a LAN compared to my stationary PC at home. It was way cheaper than my stationary at home.