They don't "just roll around." Quite the contrary. I understand FC is some kind of spin-off from DWW (i.e., Hana), and the action is well within DWW's range of intensity, which is saying something. FC also has about the highest level of video quality I've seen in this stuff: unlike DWW (and many others), when they say it's HD it's really pristine, down to the fine textures of the areolae (if you enjoy that sort of thing). About the girls I have mixed feelings. They're all pretty Eastern Europeans (I especially like Domino), but they're generally way too skinny for my tastes in erotic combat. There's also nothing on the site that makes me care very much about the girls--who wins and loses--and I find their scenarios lame. But I'm hard to please.
Anyway, search YouTube for the company name and you'll find plenty of unauthorized samples so you can make up your own mind.