I have all the gm Tuning School books, I purchased the online essentials course for gen v. It was very disappointing, It did help me understand the driver demand and virtual torque better but it didn't help me with tuning just a stock truck. Playing with the driver demand tables for better throttle response? Some say don't change them, some do. I submitted a ticket and really didn't get an answer other than (in their process). Buying the essential course should show me some of the process for gen V in my opinion. What about SOI and Cam timing?? The question is IS IT WORTH BUYING THE GEN V BOOK, since I already have gm beginners, advanced, maf & ve, and the trans books?? Thanks