Generally speaking, I've grown used to getting 4-5 years out of my Apple computers. Sometimes it's a bit less but usually right in that sweet spot. I'm seriously considering a MacBook as a replacement for my work-provided laptop (standard ultrabook specs) and regular usage over my 2011 MBP, which will remain around for use by my partner and myself. I'd still like to get that 4-5 year lifespan out of my computer but I'm beginning to doubt that a MacBook is going to perform well that far down the road. Now I've had doubts about my choice and considering a 13" rMBP. I'm not the biggest fan of trying to sell computers online but I know that it's an option. Would you expect a MacBook to have a useable lifespan over that time?