I signed up at match, yahoo and eharmony about 1 month ago.
Eharmony beats them all hands down. It all depends on your background which will determine which one you will have more success on. Yahoo and Match is more for everyday folk and more liberal kinds of people who are up for anything it seems. I have got a few responses on yahoo and maybe got 1 nice girl on match. However I am blown away by eharmony. I am a conservative christian 'nice' guy I suppose. I have had to stop my automatic matches being sent to me becasue I am getting overwhelmed with responding to emails all night. Out of 100 girls on eharmony I might find 5-10 attractive , and these girls generally all respond to me.
I definetely see some potential with Eharmony. It is obvious that there is a guy shortage on eharmony (65% women I have heard)
If you are a conservative guy with a decent job - then you would be mad not to join eharmony over the others......