Had an interesting thought today. I've had my 13'' rMBP for a year now, and I really love it. But sometimes, I find myself wanting the 15'' (I came from a 201l 15'' MBP) for the added power, especially due to the interface lag with running at 1440x900 HiDPI. Does anyone else find this to be true? Or do you have a 15'' and wish you had a 13''?