Hi. I'm an engineering student and I'm on 5 year old Pentium Dual core lenovo Laptop. The machine is built like a tank by the way and still usable but it lags and is very slow by today's standards. It has a pathetic 60 minute battery life and more importantly,I can't really run MATLAB well on this device. Windows is also frustrating with it's lag and stuff so I am looking towards a Mac. Now ,Apple has a really good deal on the refurbished 2012 Macbook air 13 inch (i5 version) on it's website at about 750 dollars. I was wondering if I should get that one instead of the new one which costs around 1100 dollars ? How's the battery life and performance on the 2012 model ? Bear in mind that i'm coming from a laptop with an hour or so of battery life so won't the 2012 model be a big enough upgrade for me ? Furthermore, will the processing on the macbook air be good enough to handle MATLAB ? Also ,my lenovo has lasted me a good 5 years or so and it would be a shame if my new mac breaks down after 2 years. Are you confident that a Mac will last as long as or last longer than my current machine ? Are refurbished Macs safe to buy ? Many Thanks !