My partner and I are in a cisgender heterosexual relationship.
This one is great if you and/or your partner are not that experienced (or if you are rather experienced). It creates a channel that allows for easier P-in-V insertion. If your partner's erection subsides, the condom stays in place, so unlike a male condom, you don't have to deal with pulling back a baggy condom.
It is pretty easy to insert. It is about as easy as inserting a tampon (and 10x easier to insert than a menstrual cup). The instructions on the package might not be too clear if you don't know anything about the female condom. You can look up some how-to videos on YouTube, but I'm gonna tell you what the how-to's don't: The ring is flexible but springy, and the toughest part is keeping it folded while putting it in. Also, keep in mind that the condom is lubricated, so your hands will get a little icky. Once you get the ring in (holding the outside of the condom), you want to push it in as far as is comfortable (with your fingers on the inside of the condom). It does look weird, because it sticks out of your body, and you walk funny because there is something dangling between your legs. It does not hurt; if it is in properly, you shouldn't feel it much at all. It also doesn't hurt to take it out, which was something that I was worried about. The ring conforms to your body and it glides right out. Once it is at your vaginal opening, it springs open into a circle again. It might feel weird, but it is so flexible that it doesn't hurt.
I recommend getting one for practice before you use one with your partner. If you're into saving money, Lucky Bloke has the best per-unit price on the female condom (yes, even better than Amazon). I love the female condom, and I highly recommend that you give it a try.