Well, some of them are good but unfortunately, I don't think about "jamal" and bountysuite, some of their projects are scam, amazix are good but some of them are not hype. The best thing I've know is yahoo he is the one great bounty manager i've ever made of.
Yes, you are right even amazix team is very accurate in response and the project they choose will get much popularity when they start developing the project. Even the manager Yahoo will choose a very good project which we get payment from the team after their successful crowd sale.