A few early bugs have been fixed and the latest OS X is said to be very trouble-free, so I took the plunge. It’s free, BTW.
Before I installed Mavericks, I updated all my existing software and let Disk Utility repair permissions. Time Machine had everything backed up. The installation went smoothly. No problems at all.
Now it’s time to see how well Maps work (as good as Google maps?), to try out the built-in dictation software and to see if I like the new Finder Tabs. The very first thing I noticed was that nothing looked particularly new. I like that. I didn’t want to face a steep learning curve. Some nice new features (that I can take or leave) and optimized, smoother performance are all I really want.