Along with many people here, I find both the 13" and 15" versions of the new tbMBP quite tempting. The rational thing to do is choose between them and buy one. I have the 2016 15" and am very happy with it. But I'm also constantly coveting the tb 13". Setting the money issue aside, can anyone here who has both explain their rationale in acquiring the second laptop and also what their use case is for each? Put otherwise, if you have both, does the 15 become anything more than a desktop or home-bound computer? Do you make equal use of both?