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Instead of opening ever more toolbars, which was clumsy but quick, you can now customise what goes on the toolbars. You do this either from the menu or from a friendly dialogue box containing the most common tools (that sends you back to the menus for the full set of tools).
Tools have moved in Acrobat X Pro, but that's a good thing: everything you can use to protect a document with important information — from encryption to redaction — in is now in the same place and easier to find.
Adding comments is still slightly long-winded — you can't just click to type in a correction or missing word. Instead, you have to select the tool to insert text first, even if you've just typed something, which means you're mousing back and forth between the document and the taskpane. Sseeing the list of comments in the same place as the tools is more convenient though.