I know 2 couples it worked for. One couple are married and one couple have been living together for 2 years. I am too scared to do it because I know I will end up with the serial killer! It's the way my luck goes! lol
A friend of mine is married to someone he met on Match and they've recently had their first child.
I know quite a few couples who have met through it or other dating sites and have been together a while.
I went on it years ago, had a great time dating. No relationship came from it but met some lovely guys, had some lovely dates and still in touch with some of them (from 6 years ago).