A silly question perhaps

[smp]

I've been struggling with possibly purchasing the "Guide to HP Handheld Calculators and Computers" here:

http://www.guyball.com/hp_guide.html

My struggle is with the possibility that this book may not really provide any additional information for me beyond the trove of information to be had here at the MoHPC.

I would appreciate any comments, thoughts, reviews, etc. that folks here can provide to assist me with whether or not I should proceed and purchase this book.

Thanks!

smp