I have been asking myself the same question and have tried a Samsung Galaxy Tab as a monitor using DSLR controller. It was good but not ideal. Here are my conclusions so far...
PROS of TABLET
There is no noticeable lag
Resulution is way better than most field monitors.
You have all the camera controls on screen including playback.
You have all the other functionality of a tablet
No direct mounting option
No replaceable battery
Cant plug in to power as the micro USB is used by the connection to the camera
Possibly less durable
Just spoke with an Ikan rep at B&H and he agrees on these points.
is that a special effect in the bottom left corner at 0.45?
Amazing cinematography and creativity... but the trailer didn't make me want to watch the movie. I'd much prefer to watch Art of Flight where you get the amazing shots AND the realistic snowboarding shots