The longer you teach, more frustrated you become. lol Yeah. Adapting to a digitizer's quirks use to be easier for me since I really only lived with one type at a time, usually Penabled EMR. Now I'm juggling 3 different digitizer types (Penabled EMR, Duosense 2 N-Trig, and Wacom AES) over 5 working devices so I'm slightly frazzled, but even then you can adjust fairly easily between them. As for errand marks, I have abandoned all but Clip Studio Paint in my sketch work, so errand marks are no longer an issue. Unfortunately if you rely on programs like Painter 2015 that still doesn't let you shut off finger painting, it's is super frustrating experience. I miss some of the features of Painter, but if I have to use it, I would probably resort to VAIO Z Canvas (which BTW I think will end up keeping) since it has hardware button to toggle off touch.