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 to your 3 years and amazing menstrual cups. I have had one for three years and now I bought a new one for myself and donated the other during the double campaign. Great initiative with the possibility to donate, I wish that all women in the world get a chance to discover the freedom it gives to use a cup.
Hip hip hooray! May they improve all menstrual weeks for hundreds of years!