Oh, they're solid. Especially for the price. Def NOT a need to have a physical copy, but I understand why you would want one. lol, it even says on the back, don't buy this. But, I just love having that physical copy in my hand. And I'm sure you've looked, but there are LOADS of supplements and community-created content for it.
The extra content had my eyes bulging and gladly it clicked I didn't need any campagin material. I do so love being able to flip pages and mark things as I'm setting up for a game. So I may just order them this week and save buying an adventure path for next week.