Well I have my profile all set and ready to go, but I can't get myself to submit my payment information
I can telll you that you should maybe make a seperate email address just for this site. Even though I haven't offically signed on with them yet I get LOTS of emails (like so and so viewed your profile, someone is interested, see who is new, etc).
If you decide to take the plunge let me know your thoughts.
I've done OkCupid and Plenty of Fish. Both are free and I met 3 great guys on OK Cupid; unfortunately you really do get what you pay for (lol) and none of them were totally honest in their profiles.