I purchased this item a few days ago as the game was actually released. I am pretty disappointed with this guide. It does show you where the dig spots, silver keys, demon doors, and treasure chests are located, but I was really hoping for better coverage for the towns.
As many of you who have played the game know, the mapping system is pretty poor. What I was really looking for was a map of each town that showed where everything is located. Specifically I wanted a graphical map, with the name of each store located on the map. This guide does not have that. It does list the stores in a table that are in each town but it doesn't tell you where they are.
There are some good tips, but it leaves a lot up to mystery, I'm sure in the spirit of discovering things for yourself. For example, basic things like how do you have a child in the game? It does not tell you that you need to get a certain expression, or where to get the expression from. It does tell you that you can have children but doesn't tell you how. Similarly, there are all these tricks you can teach your dog but there is no section on where to get all of these. On this note, it talks about "dive" spots to find treasure underwater, but doesn't tell you how to actually dive. I still haven't figured that out.
Another problem is the layout of the book. If you are wanting to go through and find all of the demon doors, you have to go town by town looking if the book mentions a door or not, there is no demon door section. It would be nice to have a separate section for this so you could perhaps check them off. Similarly no silver key section, etc.
I think the guide has some good things, but is really disappointing to me. I have just found it really hard to navigate the book, and found vital information missing that I end up having to search the internet for. I suggest saving your money and just reading FAQ's on the internet for your game questions.