I have both books (Sonar X2 Power! and the Guitarists Guide to Sonar )setting next to my keyboards on my desk at all times. I would be lost without them and consider Scott's book to "The Missing Manual". Both of them are just great and if there is something that you can't find in them the authors will have it explained on line somewhere.
If not for Scott Garrigus and Craig Anderton- I would have never gotten my moneys' worth out of Sonar.
I'll also have to give kudos to Eli Krantzberg and the ReallyFastBikerBoy - They have both also provided invaluable insight and directions. Now if I could only remember how to play guitar.....
As for Scott Garrigus- the same would hold true for Music Creator Power, Sonar 7XL, 8.0, 8.5, X1, X1a, etc. etc. etc.
Come to think of it- does anyone want to buy about 5 Power! books for previous versions?