I have a question: I have a 2010 Macbook Pro that seems to get progressively slower and I am considering getting a 2015 model. The only problem is that the model I'm interested in is being sold on a number of sites for a decent price, where I'm not sure if there is Apple Warranty. I'm afraid of buying a computer and getting something with third party parts that would void any apple warranty. Naturally, should I run into issues, this will complicate things. One site in particular that concerns me is Gazelle, as I've read tons of bad reviews. I am on a budget so what would you guys recommend? Have you ever purchased a computer from these sites and what have been your experiences?