I'm using this extension on a few sites, overall it's really powerful but lacks in usability and ease of interface customization. Not what I can expect from a "modern" application, that should simplify our work not make it more complicated.
The quick mode is very nice until you have to customize styles and html output...that's a mess, with lots of useless html tags! I gave a fast try to the other two modes but to me they are definetly unusable and uselessly complicated. There's a bug using version 1.7.1/2 toghether with JCE that requires to reinstall JCE...WHAT???? Lose all my JCE configurations? Bah....
No joomfish integration (the owner says it's better to duplicate the whole module and translate it, but how about dealing with form modifications on multilingual sites?)
To set a simple formatted text beside a checkbox it needs a tortuous process of creating sections and subsections
For my next website I will try RSforms or some other extension, this one definetly needs some restyling in processes and output code...maybe I'll find that this is the best one anyway, but it'd be sad