I've used the Diva Cup for 6 years or so, I LOVE it. It doesn't feel like a tampon because you don't feel it at all, and I could always feel the string with tampons. There is also no risk of toxic shock syndrome because it just collects as opposed to absorbing. I have super heavy periods (as in if I had a tampon I'd have to change a "super" every 2 hours) and I only have to empty the cup every 12 hours, maybe after 9 on very very heavy days. It's also great because you don't need to worry about finding more tampons. One thing to pack and you're set! I haven't had to buy tampons in years! I recommend it to all my friends, and I will say there is a bit of a learning curve for some people, but I had no trouble. I prefer it to Instead, which is also a cup but is disposable. I never could figure Instead out, and found it very uncomfortable. Also don't feel great about throwing all that plastic away every month.
Ok that's my 2 cents on the subject of menstruation.