Last weekend I upgraded my 2013 MBA to a loaded 2015 while I hold out for the Macbook and MBP lines to get sorted out. I spend a good amount of my time with my mac docked at home or work. Previously, I've been using a 27" Apple Cinema Display, but have wanted to upgrade to a 4k for some time. I'm interested in using a single Dell Ultra HD 4k Monitor P2715Q as a new docking monitor now, and possibly adding a second one when I eventually upgrade to a stronger macbook. Is anyone here using their 2015 MBA with the P2715Q? Any other 27" monitors suggested I take a look at or other thoughts about getting an external display for now and later?