Having owned the 13" Air, two different 11" Airs and finally the 2015 & 2016 12" MacBooks, the size and form factor was definitely important to me. This new 13" TB MBP is pretty much perfect size-wise; it's what made me give my 2016 12" MB to the wife. I really do like the form factor. Not all that much bigger than the 11" Air (I know this because it fits in my Waterfield Muzetto bag that was made for the 11" Air.) Also it is very well made and slim with no flexing when picking it up by the palm rests. Also, my 13" TB MBP stays pretty cool--only occasionally getting warm during software updates and when using Parallels--though never too hot to use on my lap or anything. All in all, a great form factor for a more pro machine with added USB-c/TB3 ports. And having already owned the previous MacBooks, I have the two dongles I use the most (c to A and c to Gigabit ethernet.)