GTD Fast and GTD with work-life balance
I have listened a lot to the series GTD Fast, which is 8 discs. I only just relised that there is a new(er) collection on the GTD with work-life balance, which is 7 discs. There are also a lot of other discs, such as the GTD System set, which seems to have about 6 discs. I have read both the main books as well (GTD and How to get things done). How much more value did people find going from the 8 disc GTD fast to the 7 disc set? Is it genuinely useful or not valuable enough?