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.
According to me, there's only advantages to not have to use tampons and pads. I convice all my female friends to try a menstraul cup cause it's simply the best!
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.