Hi Rubyisthe1001, I personally don't use it, but one of my friend does, so I will just share what I've heard - not from my own experience.
She said that after about a year of using it she got pregnant and logically, she doesn't recommend it. She even warned me about it when it happened, but don't forget that all people are different, so it can work for you. Maybe she did something wrong, of course she says that is not her fault but you never know so you just need to be careful. Also, other people feedback that they feel it during sex and it's kind of uncomfortable, but once again, all people are different so you never know; for example my friend never had this problem. There are many women as well who recommend it (when my friend started using it we've done a reasearch on it). You might have problems with it and you might not, so I personally would use traditional condoms so just to be sure (even condoms is not 100% - about 98%-99%) so be careful if you are young and really don't want a pregnancy now.
Good luck and take care of you! Enjoy your sexual life!