Disadvantages of this editor compared to text editor:
*(in preview) citations preview (by hovering mouse pointer on citation number [1]) doesn't work,
*needs one click extra to see a preview,
*no simultaneous preview and edit (maybe option to open preview in new tab/window?),
*no preview with another page (useful for template editing or doc pages for templates using PAGENAME),
*when progress of loading visual editor stucks, this editor doesn't load either.