I have been considering moving to Mac for my next laptop purchase for a few months now. Used to be a Mac hater *hangs head* but there is no denying that it is the best quality and will probably last me far longer than other laptops (which is my goal). Found a Mid 2012 15" rMBP 2.6 ghz 16gb ram 256 ssd for $1900 on Craigslist! I already checked out the serial number and everything looks good, it was purchased around last December, so I still have about 9 months to do Applecare- my wallet will need to wait. It is more than I need as far as RAM but I plan on having this thing for 6-7 years. I own a graphic design business selling pretty things on Etsy, so there will be heavy Adobe use. Here is the bad thing: I have never used a Mac computer so I will definitely look like an idiot trying to figure out how to check this thing over. Yes, I played with one for 20 minutes at the store and marveled at how amazing it was, but as far as how to get around in Mountain Lion and understand Macs in general... I will need a couple of weeks. I plan on checking the battery cycle count, matching the original box serial number to the one on the computer itself, about this mac, and just generally fiddling with it and checking the screen for dead pixels. At least it is covered under warranty for another 8 months, so that is good. We are meeting at a Mac store, so I was wondering....Is there a special test or thing I need to look at other than the items above to just make sure it is ok? Will the apple salespeople be willing to check it out for me as well? Thanks in advance.