Of course you will. You have no choice in the matter. The original Saab manuals are long out of print and rare as hen's teeth. So you will buy it, and you will join the legion of Saab 9000 enthusiasts who affectionately call it "the book of lies."
You will supplement your purchase with an Alldata subscription, because really, you will want accurate wiring diagrams and component placements.
You will become a denizen of www.saabscene.com because the wealth of experience there will let you know when the book is true and when the book is false.
And with all those things, you should be able to get many miles of driving pleasure from your 9000.
But don't think for a moment that you can rely on the book alone.