I think all informants embellish their stories from time to time especially when they are pressed by the fbi. But i think montiglio is better than henry hill. I mean he has talked a lot about roy's murders and all the info checks out. Also he was the nephew/surrogate son to a highly respected capo so i think he was involved almost as much as the made guys are. I mean his main job was to bring money to nino or to paul from the demeo crew.