+ very stable (din't have any problems/errors during test)
+ ease of use (good feature is the right-click menu)
+ easy to setup
+ seems to let your HTML code untouched
- uses outdated HTML code (formatting should be done by CSS)
- no XHTML (or am I overlooking something?)
- missing feature to insert internal links pointing to existing content
JoomlaFCK is a very good editor for small (non professional) pages. For professional/commercial pages I can't recomend due to the fact it's using outdated HTML and no XHTML.