Hi, I am looking to buy a 15" 2.7 GHZ Macbook retina with 16 GB RAM and 512 GB SSD from craigslist. The laptop is about 4 weeks old, has 12 battery cycles and comes with a 3 year applecare. It comes with the box and the original receipt and it's costing me 2300. Do you think it's a good deal? With me having never used a Mac, am unfamiliar with the checks that need to be made before purchasing it. Any help with this is much appreciated. Thanks.