I've been using doublelist for a few months, and while its not without its problems - its worked pretty well so far. Granted I'm gay and I don't post in the straight sections, so I can't comment on those. For the most part the quality of the people is higher than Craigslist was and I get 5-10 response to a post I do. Maybe I just post good posts, I dont know, but can't complain