After launching around 30 Joomla-CMS including the JCE I can't imagine not to use it in the future. Documentation is good, support and development as well.
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 ;-)