AmaZix do run professional bounties and can always be contactable for issues. They respond in a quick, timely and effective manner so these bounties can be replied upon to get a fair pay out. Obviously they can't guarantee that the team behind the coin actually pays, but you won't get shafted by them in the bounty process if you play by the rules. One thing to consider when taking part in AmaZix bounties is that they are pretty rigorous on content bounties so don't think you will get paid for creating low-quality content! Read their guidelines and you should be putting yourself in a good place to get the final payment.
Yes, this is the real truth, I participated in many of their bounty campaigns. The kids are very strict but fair. Not quality content immediately flies into the stove. But if you do everything right and on time, you will receive a good reward.