Absolutely love my 13"! My second Mac, coming from an '11 Air and this feels snappier. Gorgeous screen, fantastic build quality - a piece of very fine engineering.

I asked as i have a 15" refurb 2 days old that gets hot back of keyboard, mainly with video or when i was transferring iPhoto and files. Not sure if to swap for a 13"
good to hear that your not having any lag issues especially on chrome. you can try to download safari webkit and compare it with chrome. see if there really is no scrolling lag especially on facebook and other heavy loaded websites. you can also try to set your display to 1440x900. open facebook on safari fullscreen and compare you HQ photos with chrome. cause mine when set to 1440x900, photos are as sharp as i would want to them be(SAFARI). just like how i edited them. but again only in safari and not on chrome which is my main browser as well
I have both the 13" & 15". After Apple issued the latest update the 15 runs cool & quiet. I greatly prefer the 15. It's slightly larger footprint is barely noticeable. The extra screen size is more than worth it. The difference in weight is negated as its spread out over the slightly wider, deeper case. It's the best MBPr yet.
I asked as i have a 15" refurb 2 days old that gets hot back of keyboard, mainly with video or when i was transferring iPhoto and files. Not sure if to swap for a 13"
aside from the scrolling lag issue(chrome) and the vertical lines i get on the screen because of the lag i think this is the perfect laptop for now for non gamers. i noticed that facebook photos looks pixelated on chrome, safari webkit especially on best retina display setting. best display setting i think is 1440x900. fb photos are now sharp but only on safari native app fullscreen. still not on chrome and webkit.