I'm a doctoral student and use the 15" MBP for statistical analysis, Unity, etc...but also a huge amount for writing papers/grants. When I travel I always bring my 12.9" iPad for reading/annotating documents, but also like to have a laptop with me to do word processing/use Slack/etc. The new air is quite appealing because it seem like it has great battery life, works with an external battery, and is much lighter than my 15". I originally liked the 13" MBP more than the 15", but unfortunately the battery was too poor (I've heard the new 13" MBP is now better on that front). Curious what y'all think? Maybe it's too redundant but have been thinking about it for quite awhile.