I have a few of them, wouldn`t mind but I contacted them about some of them one being the installer of a toolbar, never got the tc for it, contacted them and they asked for the email or proof that I installed it. Well no email since you don`t get emails from toolbar makers, I sent them a screenshot but stupidly they just said the same thing.
Not all of them are failures though, 3 surveys I did I actually got tc for, shame not for all though.