Been on eharmony for a week. Paid for 3 months. Things I hate about it:
1) they seem to send you matches at planned intervals - so it's not like you can sign up and get a vunch to sort through right off the bat. It's like they release 8-12 a day.
2) they don't show a last activity or join dates for matches so you could be getting some people who are no longer active
3) the matching system is a joke - end of story.
4) you can't go back and refine most of your answers - once you save them that's it. I understand the logic but if you're getting bad matches and you would like to fine-tune your results to be more accurate, well, too bad.
5) you can't specify the # of kids your matches can have. I have no kids and would be fine with a match with 1 kid but not more than that.

And someone else mentioned that a few years ago she only checked out eharmony but never signed up and they still bomb her with emails. Yes, I have experienced that as well from when I tried them out 2 or 3 years ago.

Overall, very disappointed. Don't waste your money.