I have a 15" Samsung Series 9 i7 for work. This machine looks amazing but the i5 is saddening, i7 + SSD makes compile times etc amazing and I can't give than up for a nicer screen :(
I mostly look, these days, for the best possible portable pane-of-glass I can get that allows me to do all my work on "real" computers -- in the cloud and in our office lab. I'd much rather have epic battery life for my web browser and terminals than have more cores in the thing I carry around.