The plugin works fine and has rather elegant features (such as the mini-editor toolbar that appears when you select some text), but there’s a glaring UI issue in the location of the validation button: it should be put in place of the edit link (on which you click to toggle the editing mode) rather than being located on the WordPress toolbar. Like a lot of the 1-star reviewers, I’ve found myself very much puzzled the first time I edited some text, trying to find out how I could toggle back to the normal mode.

If that little issue were to be fixed, that would definitely make this plugin a 5-star for me.