13" is very sufficient. I had it for 1.5 years. I switched to 15" only to get more real estate for other purposes such as photo editing, coding etc. Since this has now become my mainstream computer and I dislike using my desktop computer, I switched to 15" and very happy with it. Besides the display, 15" models come with quad core processors as opposed to 13" ones which are dual core processors. So the choice for 15 versus 13 is more than display only, BUT, for videos 13" is too powerful and good. I never had the fan kick off on my 13 more than once (while downloading mavericks). New 13" also has force touch and ... next-gen retina?? - go for it.