I have had my SlateVision for 4 days now. You can probably follow the reviews on Anandtech and whatisnew.com. They are pretty on target with the SlateVision. For the price its a good way to get into the game.
One thing very worth noting: It took me a few days to figure out that the viewing angle is best from the "upside-down" position from default. If you use the SlateVision in the up right docked position, the default orientation is fine. In any other tablet use, especially with the SlateVision parallel to the ground, I use secondary landscape (upside down orientation).
Discovering this one adjustment has made a world of difference in useability. This position should be default in my opinion.
I love my SlateVision and will be putting its features to the test.