It doesn't leak at night as pads do, it's cheap and environmentally friendly, but mainly that it doesn't dry out my mucus membranes and doesn't contain bleach and pesticides that I don't want anywhere near my uterus.
Congratulations, such a great invention! I would be happy if teenage girls learned about this amazing product and see it as choice number 1 instead of cotton tampons. Information and knowledge spreads through the school system and some bloggers :)
A small revolution is what the menstrual cup is. No purchases, no smell. Freedom to just be for a whole day, no waste, always available, no chafing, no itching. Simply the best!