In addition to being a free dating site, which makes it better in my opinion right off the bat, it was started and run by the same nerds who brought us Spark.com back in the day. So they occasionally troll through all the mounds and mounds of data they have on dating habits and come out with these statistical analyses based on tens or hundreds of thousands of users. Sure, it's maybe not "scientific" in some sense, but really it's probably better than surveys or whatever, because this is using trends in what people actually do and say, rather than what they say they do and say.
Anyway, that's all for now. Back to work.