I am rather conflicted over this toolset: It is simultaneously very useful and so obvious as to useless to me.
In short it is a collection of forms that when used together and filled out will give you a "DM's packet" covering the basics of your campaign from house rules to maps of dungeons. Now I use MS Word all the time and steal tables from the SRD, from business documents and the like so I have a good range of different formats to arrange my campaign notes. This knocks out some of the usefulness of this product. For example, there are quarter page panels for noting changes to each character class, for my campaign I just grab the root files from the SRD, edit them and give those to my players. As I said some pieces are of little utility to me.
On the other hand some bits are really useful and delightfully designed. The dungeon design sheets with a little grid for a sketch map are brilliant, as are the sections for countries and taverns!
Using the Campaign Planner can really springboard ideas if you are stuck (example the legendary treasures sheet and the found/not found check boxes!) so that's a big bonus.
Overall I am rather torn, I want to give this 4 stars but can't because of the less useful sections and because I can't enter text into the PDF itself.