Picking up facts, and where the story leads is definitely what PRing is able to do. The one thing that it can't do is give you that vivid, in depth, and "meant-to-be" timeline imagery that normal reading can give. However, after mastering the PhotoReading system, you'll find that if you go back to your old habits, it's actually a lot more enjoyable and smoother.
I'm currently plowing through Lord of the Rings:The Two Towers, and have done a few activation passes, and am currently going through it sentance by sentance. Some tests that exist today unfortuanately are stupid. They ask questions that have absolutely nothig to do with the story, so you don't know which things to activate, and which to not. This forces me to go through the entire thing and not have to SuperRead.