An optional book.
It's full of various alternate rules, most notably for character creation; new races, new qualities, karma gen and priority character creation.
I think a few of the qualities might have ended up in the Anniversary edition.
I happen to like the more detailed Lifestyle rules, they appeal to the obsessive interior decorator in me.
It's been my experience that GMs tend to not use a lot of this book.
Overall, it's not bad, but it's not great, and it's probably better to get one of the other supplements.