What should I consider before buying a used 2015 15" MBP? I've been watching Craigslist for a while with this hankering in the back of my mind to buy a used 2015 MBP. If I decided to pick one up, what issues would I have to consider before buying? For example, cost of replacement parts, parts that cannot be replaced, or other factors that will make it unusable/obsolete in coming years, etc.   
   
Also, what would be a good offer on something like this machine?   
   
&gt;2015 Macbook pro retina 15" 2.8ghz i7 16gb ram 1tb flash storage

