I'm working on a Rails project and I'm in need of a user-friendly WYSIWYG. I'll say this about the type of people using it: Whatever you think of as user-friendly, perhaps think one step below that (not an insult, just a realization).
Ideally, I'd like something where one could have basic functionality (lists, links, bold, italic) and see in real-time. Kind of like OH MY GOSH IT'S RIGHT HERE IN STACK OVERFLOW AS I CREATE THIS POST.
So, um, yeah: something like this would be excellent (although I'd prefer the windows be side-by-side rather than this editor-on-top situation, but I won't be picky).
I'd suggest to use gem ckeditor it's really perfect solution, i used it recently in my Rails 3.2 project