Thoughts on the Menstrual Cup?

I Recently heard about a little contraption called a "Menstrual Cup." It's a flexible cup or barrier worn inside the vagina during menstruation to collect menstrual fluid. There have been a lot of commotion about tampons lately and I'm curious who has tried these cups and their opinions. The reason for my curious it is because I recently got off birth control (due to some issues that it could be contributing to) and I'm 30, married and will be prepping for babies soon :) I've read (and my doc mentioned) side effects of getting off birth control are bad cramping and heavy periods. Wondering if I can put aside the extra super tampons for this cup-thingy. 
Thanks in advance for your responses!