Haven't heard of the Lee Ban Chen's book. But I have read Farish Noor's the Other Malaysia, that one is an excellent read, loaned it from Piow, i tell you, it could be a good Sejarah textbook,.. which is definitely much better, and makes more sense than Mahathir's The Malay Dillemma.
Another good book I would recommend if you want to understand Mahathirism would be
Paradoxes of Mahathirism - Khoo Bhoo Teik, Oxford Press, 1995.

In that book, Khoo Bhoo Teik cleverly outlined the traits of Mahathirism - populism, authoritarianism, social darwinism/racism/, Islam, modernisation - it is full of paradoxes, sometimes you can even see it as hypocrisy. Yeah, sometimes, Mahathir has a lot that contradict himself.

I think this man has a great wealth of wisdom, in him, but also wrong impressions and wrong decisions, which he does not want to admit.