I sleep much better. (But you have to take it fairly late at night; as Seth Roberts reports, you sleep less well if you take it in the morning.)
On the down side, because my sleep is deeper, I don't remember my dreams nearly as well. Now I'm not one of those people who thinks we can interpret our dreams accurately. But our dreams are excellent for shaking us up and forcing us to views things or people from another perspective.
"Hey, what's going on!? Huh?"
Having dreams is like reading a corny management advice book, no? Those books have no real content, they simply force people to think about what they are doing.
Or are dreams like viewing the blog of one's subconscious?