It has mescaline in it, that is about all u need to know. The one and only time i tripped on cactus, the trip was kinda mild because I had a impotent cactus. It was sorta 2c-I ish.
I'm not going to try to descibe my trip. I dont know why ne1 even bothers to try... It's not like you can recreate the experience with words.

http://en.wikipedia.org/wiki/Mescaline