I use them but this year I have received no jobs as a result. I did get two jobs at a town home center last year that paid well so I kept the service up. This year all the leads I get are 40 or 60 miles away and single homes. I don't even follow up on them. If you are in a heavily populated area like Adrian said, it is probably a much better closing rate.
I actually talked to them yesterday about joining, almost did and then backed out at the last minute. If you bargain with them they will cut the $99 to join to $49...
They just called me again about a week ago!! by the time i got done with him, he was asking me for a job!!