Not sure they're any warmer...
- Familiarity: I've used it several times
I've worn these a couple of times at 15-20degrees and I'm not convinced they're any warmer than my Rapha Winter gloves.
I haven't worn them yet in anything colder than 15 degrees. That is maybe where I will notice the difference.
I'm a petite woman, and the Mens S fits OK. A little big but not nearly as big as i would have thought. I think they'd be fine for any woman over 5" ft.
The 4 fingers didn't take any time at all to get used to.