I have. I liked it. Several times. I'd do it again but... it
   lasts too long. 8 hrs. The first four are great: specialFX
   galore. The next four? You just wanna get to sleep because you
   have work/school the next day and food tastes like plastic, even
   in your stomach.

   But.. you have to be psychological stable more or less to do it.
   I suppose I am. All mine were good. The only bad moment was
   looking in a mirror and visualizing a scene from the Poltergeist
   movie where the skin on the face gets ripped off, but within a
   few seconds of, "woah omg" I started laughing at the absurd
   thing happening in front me. I KNEW then what tricks my brain
   was pulling on me, and found it funny, 'cause I knew it wasn't
   the least bit real.

   But do you need it? Did I need it? No.