Its good for dieting as it effectively knocks out an appetite IME. Also good for some extra energy if staying up for long work shifts or something.
If vaporized with some cannabis it will provide a mild relaxation.
When made into a tea with Kratom, it (Kanna) paradoxically (and quite strongly) knocks me out to sleep in less than 20 minutes.
Nothing psychedelic noticed, purely utilitarian herb. Although if you take a huge amount and suffer all the possible side effects from it, you might get a glimpse on to something but sure it won't be worth it.