I have been using a maxed out late 2011 17" MacBook Pro, the highest spec model 2.5ghz i7 with SSD and 16gb ram. It runs fast and smooth even on El Capitan (not sure about Sierra) It is a dated computer by today's standards I guess, but it doesn't feel like it. It still looks almost brand new, runs high performance apps very well, launches apps and boots very quick. I have thought of upgrading to a 2015 model simply cause I have had this model now for almost 5 years and it would just be a change of look, but have wondering if it really is worth the trouble since I don't have an issue with speed, but maybe I have been complacent and what is out there now is a lot better? Has anyone done a similar upgrade? Also, how is the glare on the 2015 macbook pro displays? I have a high res anti glare display and really enjoy that feature especially when I end up working outside. For those asking why I am not considering a 2016 macbook pro? Not into this USB-C thing, the lack of ports and upgradability.