I'm considering switching to a 13 inch retina MacBook Pro, I'm taking some classes and would like something a little smaller and lighter but I don't want a MacBook Air. My problem is, my curent mid 2011 15 in. MacBook Pro has a dual core i7, 256 gb ssd and the switchable AMD 6750M graphics, I would be downgrading to a dual core i5 with Intel graphics but that retina display, improved battery and smaller size is very tempting. Opinions would be greatly appreciated, thanks.