I've used it several times. Sometimes it had no effect I could see, but on reading this thread I suppose the peep might have got older or younger. A couple of times it acted as a "yummy" candy, with a praising effect, and another it acted in the same way as "nasty" candy, and worked in the same way as scolding. Another time it seemed to make the peep hyper, although I'm not sure.
All in all, it seems rather dangerous!
_________________________
To err is human; to arr is pirate.