Internet dating is like trying to shoot a fast moving black cat in a dark room. You could be lucky but the odds are poor.
The + side of paid sites is that you know people are serious; the down side is that they have fewer active members.
In otherwords it's all about luck. You could be on a free site and Mr Perfect for you happens to be signed up that week and you connect. You could be on a paid site and zilch. If you want to meet someone just try them all in rotation - each one for a couple of months. This is no bad thing because it is the new users who get the most attention.
My single friend - this would be my top pick every time. Decent people who you know have at least one friend who rates them.
Match.com - I found it a waste of time as it has loads of dead profiles. I read an article about it posted on here I think. Some guy did research on it.
Times Encounters - Ok - but the men are very much of a type.
Guardian Soulmates - I never used this but
Eharmony - the whole question and answer stuff is very protracted. The + side of this is that the men on it are 100% committed to finding a relationship and you do get to know about a person. the - side is that ultimately dating does have an element of sexual attraction and it doesn't really matter how compatible you are if you find them grotesque.
OK Cupid - I liked this site myself and found the guys there were a bit more proactive and dynamic. It has a reputation though.
PoF - I found this fun. There is far more weeding of the weirdos/married to be done here but because it's free they have a big active user base and its more relaxed.