Do I need it? No. Have I bought it? You betcha.
Thanks for highlighting this as yes cups are usually sized on your age / if you have given birth or not. The description says for this brand "We recommend choosing the size of your Tampax Cup based on your flow and the tampon size you usually wear. If you use Lite, Regular or Super tampons (1-3 droplets tampons), try a Regular Flow cup. If you use Super Plus (4 or more droplets tampons), try a Heavy Flow cup." which is very different.
Description on a box is confusing. Size: it doesn't depend on a flow, small size is for younger/pre pregnancy girls bigger size is for older/post pregnancy girls (at least if it comes to diameter of a cup). If you chose a wrong one it will leak.
I agree. I have a MoonCup, best menstrual product I have bought. I did pay more for the name, but weighed it up against the cost for disposable sanitary products. Over the last 18 months, I have saved a lot of money! I wanted to feel reassured that the silicone was a good quality and that I could go back to a company if I had any issues. This is a good price and I would recommend anyway to give a cup a try.