This week I have spent a couple of days setting up a new 12in retina-screen MacBook. I bought it with the intention of trying it and then swapping it for a more powerful 13in MacBook Pro if I don't like it. So far, though, the omens are good. I do like it; and above all I love the lightness and thinness. This is one gorgeous little laptop that, frankly, makes the iPad Air redundant.
The problem with small screens is menu-bar creep. The utilities you add, the longer becomes the right-hand platoon of icons. It soon threatens to engulf the lefthand application menu bar and it can be difficult to see the wood for the trees.