Can anyone comment on their first few days of transporting the TB MBP 15" to different locations? How portable is it? Is it light enough to justify the additional screen realestate and compute power? I am a current MBP 13" late 2012 owner and considering the new TB MBP 15" for the additional screen realestate and power. I travel 200k+ miles per year and am on the road 75%. Does anyone that travels a similar amount carry the 15"?