Menstural Cup

So I’ve been thinking about trying a menstural cup but I have some questions for ladies that use them!

- do you need a panty liner just incase of leakage

- is it good to use for heavy periods?

- Is it safe to use right after you have a baby?

- how far up does it go?

- can you guys feel it when you sit down or lay down?

- when does it need to be cleaned out?

- what brand is best?