You see supplements like this and you all yourself why you should pay for yet another non-essential book just to run a home game every other month.
Well you don't have to. But the book is worth it. The NPC-gallery alone saves you a ton of prep-time with exciting features beyond the original choices from the core rulebook.

I haven't implemented the subsystems yet but will be doing so very soon. They're a great possibility for those of us who want social encounters and interaction with the world to be a more essential part of the game. Cause your players will remember times they had to roll dice with more emphasis, looking up and down their character sheets and trying to come up with a clever or epic or foolish solution....

We've been running a game with one dual class PC and so far it hasn't broken the game. It's a small group, though. So I can't tell if it'll feel different in a group of 4 or more.
adventurous informative inspiring medium-paced
Plot or Character Driven: N/A
Strong character development: N/A
Loveable characters: N/A
Diverse cast of characters: N/A
Flaws of characters a main focus: N/A