Includes advanced Image/Media, File and Link handling, plugin support, and an Administration interface for editor configuration.
I also enjoy the setup of different profiles. So you can have different buttons for unregistered front-end users. The commercial plug ins are also worth buying! The image manager is really powerful! Most of my customers are Joomla rookies, but with JCE even they have the ability to crop or resize images.
The options for individual adjustments f.e. reaction to return-key, custom-colors, file-types for link-handling, etc etc. are great. It tooks me a while to explore all user-options, but meanwhile I know where to put a hand on ;-)
Wat I especially appreciate is the possibilty to have different layouts for different (groups of) users. I typically enable nearly all features for power users. For my less skilled users, I have a very simplified subset of functions that appear.