waaaay too small. you would be constantly zooming in and out
I think you might be missing some aspects of it. Sure, the screen is smaller (physically and in pixels) than your standard desktop, but think of it as a trackpad or digitiser and it is HUGE. And some people find a pad better than a mouse. Those (and the mouse) suffer from not being attached to what you're looking at, though.
These pen tablets could (and I don't know if they do) simply replicate the part of your main screen that you're working on. They wouldn't be THE screen, just a view of the working portion of the real screen. You could continue using them without ever looking at them, but if you did look at them then you would see them as you would writing on a bit of paper. I can imagine doing major things as one would with a normal digitiser, but then when you get to a tricky bit instead of having to zoom right in you just look down at your pad and see exactly where you're putting your dots. A reason you need to zoom in a lot on a normal screen is because of the mismatch of what you're looking at and what your hand is doing. With better visual feedback you might not need to do that.
But I don't know. I am reluctant to splash the dosh to find out it's nothing like that at all, hence why I am asking if anyone has tried
