He thought the tablet itself was very light, and he liked the fact that Sony gave the tablet 2 touchscreen technologies (IR and pen-based electromagnetic induction). He reported being able to write notes on one part of the screen while flipping pages on another section of the screen. My source also noted that the touchscreen was "smart enough to ignore your palm when you place it on the screen when you do handwriting".
My source didn't have time to shoot a video, so here is a report from DigInfo.tv. There's not much in the way of user reports on how well the slate works but the video does confirm a number of features.
This writing slate is scheduled to enter a pilot program at 3 Japanese universities this Fall. There's no solid info yet on when this slate will ever see a commercial release or what it will cost, but I'm sure Sony is working on that as we speak.