Menstrual Cup?

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As much as I love having an excuse to run to Target (can I get an amen?), I'm pretty sick of my monthly tampon run. Seriously! Tampons are so expensive; I feel like I am flushing my money down the drain.
I've recently looked into the Diva Cup and other menstrual cups, and I am interested in all of your experiences.
I want to know: what cup do you use? How long have you been using it? Experiences? If you could go back, would you do it again?