The auto-complete "feature" in slickedit is enough to make me go to something like vim, or pointed sticks and wet slabs of clay. I spend more time and keystrokes getting "out" of the auto-completroid than I do actually typing. This feature is frustrating beyond the words of mortal man.
That said, there are time when I'm editing a Javascript file where it's actually useful. Sometimes incorrect, but sometimes it works.
It's too bad there isn't an easy way to turn it off and on dynamically. As it is, I have to permanently disable it with extreme prejudice - an action I suggest for whoever came up with it.