I like both TinyMCE based and FCK based editors but this one is more stable than JCE and it is lighter. Some plug-ins like color picker,... use JS instead of open popup windows and run server scripts so JoomlaFCK is faster.
Changed editor to JoomlaFCK immediately after install!!!

I want to provide comment function on my new site and got this component. It is really buggy from installing to functioning at first. I have to fix all way out from the front-end component to the back-end.
I dont know if you get the same bugs but here are some i fixed:
- Install code need strict php tag
- Toolbar for view comment in admin section, also the comment list problem with publish/unpublish/delete/edit
- Check again security code when write comments
- Configurations is not save
- Sumit comment when web server does not turn form variable on
If my review is helpful, i will make my fixed available on my new site when it goes live.
Anyway, a very nice component.
I will fix the XHTML problem when I have time.

When use this editor, you cant save\apply new configurations. I have to change the editor to NO HTML

Simply open the language file in the Back Office and save it. May file ecoding cause that error.