I've got a 2012 non retina MacBook pro and having been looking into updating to Yosemite from Mavericks. The MacBook has 8GB RAM, the 2.6 i7, and the stock 750GB hard drive. So how does it run on this? And how does the screen look with Yosemite on a non retina display? Because the retina ones look awesome. Should I upgrade to 16GB RAM before doing so? I'm just looking for some pros and cons on updating, so thanks for all the tips and thoughts