So far I have found the maps app incredible, you just fly over the map and kind of glide your hand where u wanna go, and the 3d scientific 'skull exploration' app is also brilliant.........for studying 3d models I think its brilliant, maybe someone who works with 3D models would love it.
I have found it **** so far, well im having trouble using .......gesture interface on windows 8 even though its a touch enabled OS. And the painter app is also very difficult.........
In conclusion, and probs a reflection of a human mind in 3D space, I find 3d apps with depth incredibly easy to use, easier than a mouse, however 2D environments its frustratingly difficult.
EDIT: Do u want me to make a video of me using the device?