I remember reading this book back in 1999 when I was in college and a baby Christian. It felt like I was reading through a veil. Now as I reading it, I can see clearly now of what Dr. Price was talking about.
Dr. Price is good for challenging our thoughts, which he did in this book. In order to understand God's plan, we have to understand the Kingdom of God - which is His way of doing things. The one thing he said that challenged me is near the end: if you are in debt when you are trying to start tithing, pay your debts and start little in tithing (as this will affect your witness).
Although this book is no longer in print, you'll find many of this information in his 2006 book Prosperity: Good News for God's People.