Does anyone have any experience with them and if so, how would you rate them compared to standard condoms?

Never ever use two condoms at once.

The latex rubbing against each other can easily tear leaving you with no protection instead of double the protection.

I've only had one FC experience.

It was nice, but two things stand out as problems:

First is the amount of futzing around she has to do to get in installed.  Most gals can install a regular condom in about two seconds (Some can install it with their mouths which is nice.).  A FC takes about half a minute at best.

The other thing is that the sensation is nice, it feels noticeably cool.  I would consider warming it up in a cup of hot water prior to installing it.

She wore a female condom and had me put one on myself.... with so much latex, I couldn't feel a thing.... was a waste of time. I've never been in a situation where that was the main level of protection....

I've tried then a few times. I really want to like them, but unfortunately I don't. They're kind of annoying to install (and yeah, it feels hyper clinical and totally unsexy, so install is a suitable word), they limit the external feeling for the female to a large extent, and well... they kind of look funny.  

....i've only used them about 6 times as of now (don't get too many requests) and it's an acquired taste in a sense. Hated them to felt weird but liked the sensation and now I love them. And I can pick up as many as I want when I want for the best price ever (free).

The reviews are a mixed bag, so I guess I have something new to try

I visited ladies who use them.  They are somewhat awkward to insert which can be an interruption in the flow.  Also, I like to alternate between oral and mish to prolong the pleasure and they get in the way.

I also enjoy going from oral to a variety of positions, I though it could be left inside while doing oral and other things and you could get right back to it without any interruption.