I bought this based on the reviews, but don't like it. It does erase well, but
it has a drawback: the highlighter covers up and dulls the ink of the text
you're highlighting, rather than making it pop out. If you erase the
highlighting, the text stands out again, so the problem is that the yellow sits
on top of the ink, making the black text look gray.
To the reviewer above -- the highlighter does erase very cleanly and thoroughly,
but you have to use the built-in eraser on the tip of the pencil, not a pencil
eraser. All you're doing with the pencil tip is bringing the heat-sensitive ink
to a high enough temperature. So a hairdryer would probably do the trick more
easily if you're erasing a whole chapter or something.