i don't really like it. eeeverybody says how eeeasy to use it is, etc. yeah it is relatively easy, but it is still messy. and really not that easy anyway. i expected it to be much malleable, like thin silicone, but it is actually quite sturdy and very thick (i mean the walls of the cup are thick).
also, i think you need to be a grown woman and know your body well in order to put it in place and feel comfortable with it. i don't think a young lady would manage very well. for instance, after inserting it, you need to check that you have put it in right and that it has sealed (otherwise the blood would leak). i found that was rather messy: if you are in a public/office toilet, you'll need wet towels to clean your hands right after, or you'll leave the cubicle in a state. when you remove the cup, you need to (not only relax but also) push out with your pelvic floor muscles. i don't think all this can be achieved unless you know your body well.
in my opinion, it would be best for women who have had vaginal births or have a wide vagina.
finally, i find most of the reviews too "preach-ey". yeah it can be good for many women, but that's not to say all women ought to use it. i'm glad i've tried it so i can have an informed opinion, and my opinion is negative.
i'm not saying it's a bad product, but i'll stick with tampons.
and, just because i'm tired of reading that ladies find that tampons leak:
a) make sure you use the right size tampon for the day of the cycle,