Includes advanced Image/Media, File and Link handling, plugin support, and an Administration interface for editor configuration.
Indeed it spontaneously will add markup (mostly paragraphes) and removes some in a obscure way that will mess up your display.
Don't even think about copying and pasting html within this editor which doesn't care weither you made change in the html view or not and rewrite everything its own messy way.
I rely on images to spice up my site and showcase photography from my local niche. In turn the photographers link to me and send me a lot of traffic, so images are VERY important to my site. JCE handles this well for the most part. Again, it meets my needs, and there's always extra plugins should I want more. Unfortunately, I need to manually edit a lot of the image links, as JCE points to images/file.jpg, and not /images/file.jpg (referring to root). This creates problems on section and category blog layout pages.
In JCE's defense, it does give me the option of choosing whether or not to use absolute urls for images, but I'd rather not. It also has a "File Directory Path" which I've tried changing from images to /images, but this has had no success on html output when I use the editor to link to an image. Overall good editor but one small limitation happens to hurt my particular site.
Not only does it provide a slick interface for the most common things you will need to do on your pages it also provides a wide range of more advanced tools (image editors, thumbnailing options) which are powerful and well-designed.
The only problem i am facing is that iframe is getting stripped and the iframe plugin is paid. I did lots of research on this one and still did not find the solution for the same.