flex menstrual disc

Has anyone tried or even heard of this flex menstrual disc and if so has it worked for you? I'm attempting to use it right now because I got some free in the mail and it's so hard to put in the right place! I feel like if I could put it in right it would be great but I'm having some issues and I need help. If anyone has tried it can you help? And do you have any feedback? Thanks!