This is pretty much all of my concerns as well. The top like 2/3rds of mine is pretty accurate on the tip of the pencil when writing, but on the bottom 1/3rd it's off by about 2mm and it's freaking obnoxious. It makes me hate writing on it to the point where I've gone back to real paper. I do occasionally use it for reading papers and other page-sized PDFs, but it's really not worth the cost for writing.