The taste is bitter, you have to eat a lot or drink tea made from it, and it is hard to keep down, but once you get it over with it is a strong euphoric journey, very sacred experience it lasts for many many hours too . It is a smoothe psychadelic lots of colors and visionary experiences. WOW! it is a fantastic personal journey in my opinion.
Read about it on the net (San Pedro Cactus = trichocereus pachanoi)