From what I know, the ribs are generally “for her pleasure”, and I’ve only been told they feel “weird”. I guess wether it works or not is a personal preference.
Never used the ones from the machines, but the regular “for her pleasure” drugstore ones do absolutely nothing extra-special for me. Nothing. Nada. Zip.
I’d call it marketing BS, for the most part, but I’m sure there are some women who go nuts for the things.
I bought a ribbed condom from a bar bathroom machine once. It had a name like “Savage Bliss” or something. The “ribs” were more pronounced than those on a Trojan, and they were segmented, rather than being rings all the way around the condom.
I tried it out with my then-girlfriend. The effect was, um, dramatic. I thought she was going to smash the passenger side door open with her head. She liked it. Very much. Demanded I get more of them. Of course, she was naturally very sensitive to sexual stimulation anyway, but her reaction to these condoms was far and above her normal response.