Based on the vague info given, it could range anywhere from a steal to a huge rip off.
Looking at the pics [assuming they give an accurate representation], it is probably a 1st gen i5 due to the "ATI" sticker. If it was newer it would say "AMD". It doesn't mention a specific card either, so it probably is just integrated [HD 4250] or similar. The 8GB of memory, Blu-Ray and 1080p is nice.
I really doubt it has USB 3.0
At $280 it is a slight steal.
ASUS G73jh i7 720/Mobility HD 5870/6GB DDR3 1404MHz/Seagate Momentus XT 750GB Hybrid HDD