Yep well worth buying, we have the 2003 addition and we still use it now to gain information and try to stay ahead of the rest.
A plan for while you are there is always a good idea even if you don't stick to it. We have always planned our days putting the parks we want to visit down as we don't want the headache of sitting down for Breakfast and saying right where shall we go today. By the time you have all agreed half the day has probably gone.

Yep big thumbs up from me for Planning your days [clap]