Now, ten years later, it feels like most challenges the Courier (and now the Surface Neo) tried to solve have been solved by bigger screens, better multitasking and great pencil support.
New note taking and productivity apps benefit from the big screen and fluid resizing of apps that the iPad Pro and similar tablets provide.
The separation in the middle that made the courier look awesome ten years ago, now feels like an unnecessary hardware separation between the two sides of the display.