Thank you, sordie, for detailing the problems. I'm experiencing the same things.
Attempting to practice kanji (Chinese characters, Japanese-style) on the page in an instructional PDF has been futile for me. Far too sloppy and
inaccurate to pass even the most generous character recognition with anything beyond the simplest kanji that only have horizontal and vertical strokes. Trying to get the first three strokes of "cat" (the left part of below*) correct, for example, is frustrating. I miss crossing the initial diagonal with the curving downward stroke (it gets offset to the right for some reason) and trying to get that third stroke to touch but not cross the vertical ... good luck.
*
猫
A simulated attempt. Correct kanji on the left, on the right what usually shows up with my first three strokes when I try on the DR800 in the same way I would on paper. I may be bad, but I'm not
that bad.
(This is much larger than what I'm actually writing, which is maybe an inch in width for the whole kanji. The offsetting wouldn't be this bad if I did write this large. This is a fake example done in a paint program. Very roughly similar to what happens on the iRex. I hope that's clear.)
Another edit: again, drawing horizontal or vertical isn't bad, but it's like some predictive routine engages when drawing that second downward, curving vertical. As if it anticipates me continuing to draw to the right when instead I'm trying to cut down through the middle of the first stroke.