It's only the 2010 Model, cost me £500 great condition and fully boxed. It has Core 2 Duo, 4GB RAM, 128GB SSD. i'm super happy with this purchase.
it's average really, it's £669 from Apple for the exact same model, this is in perfect condition like new really. plus had extended apple care till 2014 which costs £200 alone.
Welcome to the Air club. just remember to take care of the aluminum brush surface and get a nice case for it. Do recommend to get a cover or something to protect the back panel and bottom. Something like this: http://www.amazon.com/iPearl-13-inch-Aluminum-Unibody-MacBook/dp/B001NJTZUS/ref=zg_bs_172470_2