I've only seen them in magazine ads and they are quite expensive. I would think that you'd have to get a big one for it to be worth while. With a regular graphics tablet you can get away with a small tablet because you are looking at a big screen (i use a 21") - I have just a puny 4x5 active area tablet but it's never been a problem. If i was actually looking at the 4x5 area, I think IT WOULD be a problem. Then again I have NO experience with them, so.......