I really like those 12' ultra portables. I have a 13" 2.7ghz 8gb 2015 rMBP - standard configuration. I do occasionally use Photoshop for very small tasks, Office, iWork. No video processing, no garage band. I'm thinking of putting my rMBP on Craigslist for trade for a 12" MB. It seems like a huge step backwards, but is it? I have heard the 12" are pretty snappy for a mobile ultra portable book. My rMBP is instant and snappy and I've become accustomed to instant gratification. Maybe I should look for a specific MB by year and would it then be a good swap? I'd hate to get the MB and it feel slow and useless compared to my rMBP. I don't need both so I'd have to make a decision.