Is it worth upgrading? I currently have version 8. A couple of things would make it worth it for me -- the ability to use the eyedropper and have it automatically be the current paintbrush color, rather than having to add it to the swatches like you do in 8 (it's really annoying), and more plugin effects. I used to have Kai's Power Tools 5 or 6, but I lost the CD a long time ago.