So i've had my Macbook Pro, 15" since 2011, its a great computer that i use everyday mainly for writing and other different things. I was wondering how long you guys have had your machines? and what the longest time you have ever had a Macbook for? i've had mine for 3 years and apart from being a little slow on start up, it is a reliable machine that has so far served me well How often do you upgrade to a new machine? i have seen the retina Macbook Pro and I've even thought about the Macbook Air (for University it would be light to carry around) But my Macbook Pro 2011 is still working so it would probably be a waste of money to buy another Macbook at this point.