Free upgrade and better stability
What do you like best?
With every update OSX becomes a bit more performant, provides more battery power and stability. Mavericks provides a lot of improvements in these fields as well. Besides that the upgrade from previous versions is usually free of charge.
What do you dislike?
Although it is quite easy for newcomers to adapt to OSX there are still confusing elements in comparison to competitors operating systems. This includes a required transition of User-Experience.
Recommendations to others considering the product:
OSX Mavericks has a lot of improvements and provides a working and rich-features environment for developing and business purposes. If you consider to use OSX Mavericks now, you should also consider to upgrade to future versions like Sierra.
What problems are you solving with the product? What benefits have you realized?
We continuously use the latest OSX version on our company hardware to maintain the compatibility to the latest software.