I myself have not 'rolled' oobers of times. Probably somewhere like 10. And there was only one time I would have "hallucinated".
It was when I was rolling at a friend of mine's place. I went over and took one pill, he did not. Once he realized I was hit, he wanted to play a song for me: Marilyn Manson's 1996. Closed my eyes, listened, and saw some amazing shit.