The insight the authors provide into how one might go about filling in gaps in logic and reasoning of story progression is invaluable. This is my first time running a pre-built campaign and second time GM'ing, so I found all of this to be extraordinarily helpful to me.
If you're on the fence about buying this, go ahead and click Add To Cart. This is money very well spent.
Edit: These maps ARE COMPATIBLE with Roll20. The dude that said you can't use them either doesn't know how to use Roll20 or is lying. I only just recently started using Roll20 so my local group could meet remotely, and I had my players' tokens on the maps in minutes.