Like half the world, I started downloading Mavericks yesterday, shortly after the end of the media event. It took 10 hours and another 3 to install. Now, had I not been so impatient it would not have taken nearly that long, but today a friend gave me an after the fact tip. Since the download took so long, I could have speeded it up by clicking on the pause button and then when it paused, clicked on continue. My friend said it would have made a huge difference. I will try that next time I have a huge download to deal with.
It download and installation was perfect. I didn’t do anything other than make sure my Mac was backed up before I began the installation.
My favorite feature so far is the notification feature that lets me click a reply button and instantly open an email addressed to the sender. I don’t even have to have Mail open.
This is what it looks like: