I've had to go the other way, 15" for everything atm, (well, + iPad for meetings). Which will expand when I've got the office sorted to ACD too so I've got something nice and big to stare at. I find it perfectly portable -–it's large, sure, but fits just fine in my usual bag , so no fuss over the 13. Don't really notice the weight, but will happily admit it's not as nimble to carry around as a MBA or 13. Seeing as I mainly have to carry it from dining room to living room at the moment though, meh.
I've had to go the other way, 15" for everything atm, (well, + iPad for meetings). Which will expand when I've got the office sorted to ACD too so I've got something nice and big to stare at. I find it perfectly portable -–it's large, sure, but fits just fine in my usual bag , so no fuss over the 13. Don't really notice the weight, but will happily admit it's not as nimble to carry around as a MBA or 13. Seeing as I mainly have to carry it from dining room to living room at the moment though, meh.