I'm meeting up with someone from Cragslist to buy his Asus... Here's all the spec of it below. But is it worth it for $800USD?

i copied an pasted this from amazon.com

Asus G73Jh -

-Stealth fighter inspired design with rear venting thermal design for minimum frontal heat signature
-Intel Core i7-720QM Quad Core processor with Intel Turbo Boost Technology to boost base speed from 1.6GHz to a maximum Turbo Boost speed of 2.8GHz (Learn more)
-ASUS CPU Level Up and Power4Gear Hybrid to save battery life and delivers extreme performance on-demand (Learn more)
-Brilliant 17.3-inch Full HD LED-backlit widescreen for an vibrant and immersive cinematic experience with resolution up to 1920 x 1080 (Learn more)
-Latest and best mobile graphics processor powered by ATI Mobility Radeon HD 5870 with 1GB GDDR5 VRAM for unprecedented gaming performance with DirectX 11 support (Learn more)
-64-bit Windows 7 Home Premium for a faster and more reliable operating system
-8GB of DDR3 RAM for ultra-fast gaming and multitasking computing (Learn more)
-1TB (2x 500GB) 7,200RPM hard drives for fast and convenient storage for all your games and media (Learn more)
-Blu-ray combo drive for watching the latest Blu-ray movies in Full HD and brilliant clarity
-High-speed Wi-Fi networking (802.11 b/g/n @2.4 GHz) + Bluetooth v2.1
-Integrated 2.0 megapixel webcam and Digital Array Mic for video calls with your friends and family
-Illuminated and slanted ergonomic gaming keyboard with numeric keypad gives you complete control in any lighting environment for comfortable gaming hours-on-end (Learn more)
-Altec Lansing speakers and EAX Advanced HD Audio to bring out the best in environmental simulation in surround sound technology (Learn more)
-Complimentary Republic of Gamers backpack and 3200DPI laser gaming mouse
-Warranty: 2 year ASUS 360 global warranty and 1 year Accidental Damage Warranty with 30-day Flawless Display Guarantee