Poker Books

Iam considering purchasing The Psychology of Poker by A.Schoonaker. Has anyone read it? Is it any good in terms of good reading AND helpful in winning? Please don't say it's a must read unless you really think so.....

I have read HPFAP, and Holdem Poker, Ken Warrens and Gary Carson's books. Does anyone have any other recommendations? I only play Holdem and only 5-10 limit and sometimes lower and feel that strategically, I don't need to read anymore books for the level I play at......whenever I have questions, I just post here.