Here is my take: arguably, they might feel better than conventional condoms, if inserted properly. There is a plastic ring which holds them in place, which you might feel your pecker bumping into if the lady doesn't insert it deep enough. However, if the lady knows what she's doing, this shouldn't be an issue.
My objection to them is probably more of a mental or visual thing. If I'm plowing away with a conventional condom, then I can look down and see my dick going into her pussy, which is a great sight as I'm sure all will agree. With the FC what you see is yourself fucking a plastic bag. Still very pleasurable, of course. But then, I also enjoy the sensation of sex with a conventional condom, and have no problem cumming while using them. I guess I'm just not entirely comfortable with the "unnatural-ness" of the FC.
Having said that, I very much enjoyed my time with Miss Hollywood and am eagerly anticipating our next encounter