However, I'm wondering if I should switch to Microsoft Office. Mavericks is my preferred version of OS X (as a lot of people here will know), and while iWork '09 is not the latest version Mavericks supports, it's the last version before Apple revamped the whole software suite, and early versions of that revamp were not very good.
Today, this means I'm using iWork '09 on OS X 10.9 Mavericks. I always figured that if I was going to use Apple's operating system, I should also use the office suite Apple explicitly built for that operating system. Ever since first switching to OS X in 2010, I've been an iWork user.