I use the logitech case/keyboard and it gets rid of those concerns about propping it up.
That does look like a very nice case... But I think this is a horses for courses type of situation. Some people will be happy with that sorts of setup, others won't.
When it comes to mobile productivity for me (which means being away from my office and desktop for a day or longer), here's what matters to me:
- a decent keyboard (Apple Wireless Keyboard size and type) - my HP Chromebook 14 is exactly that size.
- ability to use the device on my lap for several hours (when on a long train journey or flight).
- ability to position screen at whatever angle I like.
- access to my specialised Windows software (i.e. sync PC with XP netbook or have wifi access via Chrome Remote Desktop on Chromebook. Unfortunately my netbook's keyboard is crap, so I'd bring along the Apple Wireless Keyboard, if it's a long stay).
- long battery life (6-8 hrs).
- decent screen size (or ability to virtually extend screen size).
Now, Surface Pro 3 could tick the boxes for having the specialist Win software. I hear that the keyboard is apparently pretty good. But I also hear people complaining that it's a pain to balance the thing on their knees and that it gets hot...
If I had the money for it, I would probably consider it. But even then I wonder if a Macbook Air running Windows might not be better option for productivity itself, or some other high end Win ultrabook, given my needs...