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 on your 3 year anniversary! I recently started using a menstrual cup and the only thing that I'm sad about is that I didn't start with this sooner. It's amazingly great in every way!
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 :)