PDF's mixed blessings as a format has always been its uneditability.
But now you can; you can edit and add text, perform search and replace, and individually replace images and graphics extremely easily. You're still relatively limited by the page layout -- text will reflow but if you extend pass the existing area it will overlap with other page objects -- and it will substitute fonts rather than rendering a close-looking facsimile (because, well, DRM). But as someone who routinely has to pull PDF files back into Illustrator for small tweaks based on other people's feedback, I'm chair dancing. The Typewriter tool has been replaced by a full-fledged text engine, and it's faster. If you regularly grind your teeth waiting for the Typewriter tool to load, it's probably worth the upgrade cost. In fact, the program feels a lot faster than Acrobat X overall.
But now you can; you can edit and add text, perform search and replace, and individually replace images and graphics extremely easily. You're still relatively limited by the page layout -- text will reflow but if you extend pass the existing area it will overlap with other page objects -- and it will substitute fonts rather than rendering a close-looking facsimile (because, well, DRM). But as someone who routinely has to pull PDF files back into Illustrator for small tweaks based on other people's feedback, I'm chair dancing. The Typewriter tool has been replaced by a full-fledged text engine, and it's faster. If you regularly grind your teeth waiting for the Typewriter tool to load, it's probably worth the upgrade cost. In fact, the program feels a lot faster than Acrobat X overall.