Period cups?

Imalia
I'm just curious about these period cups. I wanna know if you ladies like them, and If they work well. Do they form easily to your vagina ? Is it hard to put it ? 
I've read other people's reviews on them and some people say that it kind of become a suction cup and stuck to their cervix, and that it hurts to pull out. I just want to know if it's worth it. 
Any help is very appreciated , thank you ☺️