I have a 13" rMBP and I find it a bit too small to use the small screen exclusively. Thus, I have a 27" Thunderbolt Display. In some ways, I'm trading a superior screen for a larger screen (though the net effect seems to be better since 1440p is still fine and the same goes for screen accuracy) I owned a 15" rMBP but that was back when I still had a desktop PC. I got rid of the desktop in order to consolidate as I really dislike having more than one computer as things get fragmented too easily. Anyway, the 15" was too big for travel which was what I primarily used my laptops for anyway, so I sold it in favor of the 13". I'm somewhat of a minimalist. I'm thinking now I could *possibly* get by with just the 15". I won't really save any money. In fact, I may end up spending more. But, I'll get a larger screen (than the 13"), dedicated GPU, faster processor, more storage, etc. The 15" retina screen definitely is amazing, even in comparison to the 13" variant. I couldn't justify trading my 13" for the 15" solely as I don't particularly *need* more power, but I just thought I might be able to kill 2 birds with one stone. Anyway, just wondering if any of you all get by with just a laptop and don't worry with an external monitor?