Oops ... just saw that there's a thread about this already here:
http://www.otca.com.au/boards/showthread.php?t=1569

Mods please merge if necessary, thanks.

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Regarding the book - Actually just letting you know the second one is in black and white (is this the case with the first?).

I think it will be worth it if you're interested in seeing how the artwork is done - otherwise save your money as the information about the figures and region differences is probably stuff you can find on the web anyway.