I can't see giving up my 15" rMBP for this. Never have I ever wanted to take the screen off and use it as a tablet.
And when I've been forced by circumstance to do development on my Windows machine it's been at best awkward. (Basically trying to recreate a Unix like experience via Cygwin or what have you.)
Exactly. MBP is so lightweight and robust that you can take it anywhere where you would take a tablet. Since I got my MBP I completely stopped using the Nexus 10 tablet (which I used a lot before that). The battery lasts as long for similar workloads, it's quiet, and having trackpad means that your screen doesn't get greasy. Having keyboard at hand is a plus. I really cannot think of a situation where a developer would prefer tablet-with-a-touch-screen type of interface.
Now that you bring that up (and it finally loaded the page in my browser) I'm intrigued by the pen. If this could be a good replacement for Wacom tablets (which have double the price) it would be really interesting.
Does anyone have experience with drawing on Surface with a Pen?
And when I've been forced by circumstance to do development on my Windows machine it's been at best awkward. (Basically trying to recreate a Unix like experience via Cygwin or what have you.)