I wanted to upgrade to Photoshop CS and add Acrobat Professional. For the extra money, I decided to go all the way to the Premium Suite. It was a great decision. As a the owner of a web design and development shop, I have already found uses for InDesign CS and Illustrator CS, programs I never thought I would use.
My favorite part of this program is the file management system. It is easy to use and convenient.
One drawback is the upgrade does not come with documentation. There are web based PDFs, but no books. It is daunting for an old dog like myself to open a new program - particularly one as complex as this one - and start a new project. There is a CD with video lessons that helped, but nothing beats a book in your lap when you are lost.