Talk:Lich Bane/@comment-69.230.17.228-20130204062249/@comment-6722850-20130224223845

If Lichbane is your only source of AP the proc will only have 9 more raw damage over a Sheen at level 18, but since it's magic instead of physical it won't benefit from your armor penetration and thus you'll actually lose damage on the proc by upgrading. Ultimately then you are paying around 1800 gold for 55 AP, 5% movespeed and a moderately weaker proc.

So in answer to your question, it is not good at all on any AD champion.