I tried the beta option on hewiki and had some problems with it:
- I could not figure out how to preview the result. With current editor I occasionally press "Preview" and see the result (above my test). Mostly useful on shorter texts. Here I have to go through Publish Changes => Preview. And I don't have my text and the preview in the same screen. Show stopper.
- considered switching to the visual editor as a sort-of preview. But when I edit one section, switch to visual editor and switch back, I'm editing the whole document.
So right now I disabled the beta option.