Trips often elevate beyond dualistic thinking. Common dualistic spectrums include good and bad, light and dark, heaven and hell, wet or dry, dead or alive, human and non-human, space or time...
The experiences are ineffable and unlike anything perceived by prior physical sense. The integrative aspect - taking the ecstatic vision and letting it into daily life - is an ongoing process which often takes up to a year. And so good or bad is too simplistic a lens in which to judge the psychedelic experience.
Moments of sheer terror, perceiving the blackest of black, are common. So too are moments of pure bliss and the sensation of limitless loving grace. These become trivialized by the overall experience, which is powerful enough to fully reorient a person's understanding of what it means to be a human being.
The result depends heavily on the pre-existing mental framework that engages with the medicine. For example, people from traditional western religious backgrounds may manifest demons, angels, and heaven and hell within their experiences -- if that is what _they feel they need to experience_ in order to realize the intention that they have brought with them into the ceremony.
My personal view revolves around the entrenchment of an individual's ego. Those who meditate and who have comfort with nondualistic thinking tend to ride the wave better than those who have very rigid conceptions of their self identity and its resultant patterning.
A rewarding read was the academic 'Antipodes of the Mind', a phenomenological study from cognitive scientist Benny Shannon. It is the most rigourous resource that addresses the wondrous weirdness of the Ayahuasca experience.