Mavericks is Awesome! ...If you have a modern computer :D
I have a Retina Macbook Pro with 8gb ram, 512 gb SSD HD, 2,9gb Intel Core i7 and it runs smooth. If you have a 2008/09 computer, I recommend to install Snow Leopard.
What I love the most:
- Flows amazingly with my Retina Macbook Pro, better than Mountain Lion. Less time to start, overall faster experience, less battery consuming.
- Improve external display options: contextual toolbar/dock and full view on both monitors! :)
- Finder Tabs are extremely useful and tags too.
- Improve notifications
- New Awesome Calendar