I joined up to eharmony (mainly, if I am honest, at the time they had an 'app' for it and I can look at my daily matches on the train). I had a few dates, nothing spectacular either way, a pleasant night out.
Must confess to not taking it seriously all the time (when I get to the stage where you have to ask your own questions is 'Pick a number between 1-50' and one of the traits I dis-like in people is 'a hatred of millenary').
You know nothing ventured and that.