is this a good deal?

I don't know computers, so I was gonna try and get a couple opinions on this laptop before I buy it. It's an Alienware M15x. The specs are:
Intel Core i7 Q720 @1.60GHz
- 8Gb Ram Memory
- 1Gb of dedicated Nvidia GTX 260M graphics
- 500Gb Hybrid hard drive (HDD & SSD)
- Windows 7 Ultimate

I'm buying used off eBay for about $580, shipping included.

Will be playing games such as World of Warcraft, Diablo 2 (maybe 3 if the console version doesn't work out for me), and probably some Command and Conquer games. I'm not too into BF3, so I'm not too worried about that one.
Thank you guys, in advance, for your help!