I was lucky enough to be able to install 10 on my second computer for testing since mapbooks (and the zoom and export to georeferenced tifs tool) are so important for my work. The DDP has some wonderful capabilities and is similar to mapbook in many ways, I've also found some limits including: 1. you lose the map series tab which I found to be very useful for moving between pages to see how they look or as a super bookmark, and for exporting single maps, 2. you lose the ability to tag a text box with a field attribute using 1-2 clicks, instead you have to insert one of the default provided dynamic texts, then open it up, then edit the html tag to point to the field you do want, and then save that all of which requires many clicks and switching to the keyboard and back, and if you make a mistake repeating it, and 3. I think you lose the option to suppress tiles and as noted in 1 to easily select only certain maps for export in a series, in favor of using a selection but selection queries require quite a few clicks and switches to the keyboard and back. I would add it cannot export to a georeferenced tif which mapbook never did but the zoom and export tool could for Views. If you convert an existing mapbook you will of course lose your map series and tags, and if you had chosen the clip with cross hatch option you will have to manually select one of the hatched areas and delete it. On the plus side there are some wonderful additions. I do have two enhancement requests in to add something like the map series tab (NIM059032) and the export to tif (NIM059031, I hope it includes georeferencing within it) but they didn't give me one for tagging text.