Do diet pills work? people who have used them!?

im looking for facts about diet pills. I DONT wanna know all the cons about what they do to your body, i know those. but everyone who says they dont work, tell what bad effects they have but never tell why they actually dont work. something can work but still have bad effects. so instead of saying "DONT DO IT..diet pills (blank blank) to your kidney and stunt growth, etc." do they actually help loose weight? id like to know from someone who has used them or one and can say how they did or didnt effect them. and this isnt technically for me to use them im looking for info. and i know diet and excercise IS the best way to loose weight no matter what. thanks ^_^