menstrual cups?

Katrina
Soooo, does anyone use menstrual cups? I've been curious to know how well they work, and if you guys like them? I'm so tired of using so many tampons. I'm one of those women who bleed VERY heavily for 9-11 days, huge clots, etc. so I'm tired of putting and taking out so many tampons a day then I get sore. Would a menstrual cup be beneficial?