I've been a DivaCup fan for about a year now. It took me several years to take the plunge and try it. I will never go back. It is just SO much better than tampons or pads. No more having to run to the store for supplies and getting a male cashier. ;D Traveling is SO much easier too - only have to bring one small bag.
For me it's more about the convenience and making less impact on the environment than saving money. Although the saving money part is nice too.
