The S2 is far too small and the S1 is... meh.
If those images are even close to the final product then Sony seem to have made the same mistake with the S2 as they did with the VAIO P. It's not enough to impressively cram a load of tech into a small space; it has to be usable.
The Microsoft Courier concept was clearly meant to spend the bulk, if not all, of its time in a landscape orientation with the two screens side by side. This would probably have worked, since each screen was big enough to use on its own and there was a distinct separation of the two screens in the user's mind. Almost like source and destination screens a la Directory Opus, with the genius of having the gap in between as a sort of clipboard.
The S2 is too small to make that work, except perhaps for e-books. And the minute you have to use it with the screens above and below each other that hinge area becomes an enormous problem.
For a web page spread across both screens the display would either have to break at the bottom of the first screen and continue at the top of the second, which is amazingly distracting when scrolling, or it would be rendered as a single virtual page passing 'behind' the hinge, which would be even worse. Psychologically the user would be more likely to remember those annoying times when what she wanted to read was just below the hinge, necessitating a small scroll, rather than all the times when it wasn't. After a short period of use it would start to seem that what she was interested in was ALWAYS just below the bar, leading to frustration with the device as a whole.
And the S1 looks like a cross between an iPad and a MacBook Air, totally uninspiring. Does anyone else remember the days when Sony designed beautiful kit? I still have a decade-old TR1MP sitting on one of my desks and despite being laughably thick by current standards it's still a striking bit of industrial design. Sony and Samsung were always the ones that stood out when it came to the design of their portables. These days it seems all they can do is copy Apple.
Or am I being unfair? In an age where all devices are getting smaller and thinner, and losing ports and drives in favour of cloud connectivity, perhaps it's inevitable that everything will end up looking somewhat like an iPad 2 or a MacBook Air?