A bit of a random question, and may an irrational one. Currently I have a 2014 15" rMBP i7/512GB/750m. I am considering grabbing a second machine for work around and out of the house/travel. Right now most of the time the 15" is docked and connected to a 27" Dell 4K monitor. And I really hate how hot the 15" gets when doing work on the road, especially in the summer. Since I do a bit of traveling and work out of the house, I am considering a second machine, a 13" rMBP. Use that for the majority of the work outside of the house and only bring the 15" when I need the quad core for extensive video/audio work on the road. Do any of you work with multiple MacBooks? Is this justifiable?