Wow! That is actually a very good deal. Sometimes Disney's deals aren't exactly what they seem. By just taking a quick look at it, it can add up to some serious mula.
2 adults can save roughly $375 through this plan and a family of 4 (2 Adults and 2 Children) can save roughly $485.
For $850 2 adults can stay for 5 nights, use the dining plan for 5 days, and get into the parks with a base MYW (no hopping) for 6 days. A family of 4 can do the same for $1,186. That's a good deal.
Thanks EeyoreFan for the Tip!