Many people have had bad experiences, but don't let them scare you. I have done acid many times and would never say that it is much different than an other psychedelic in terms of effect per dose. A mild dose of acid will be comparable to a mild dose of psilocybin in terms of overall strength. Ther trip itself varies between substances (LSD, psilocybin, mescaline, 2C-B etc) but i personally feel that LSD (as compared to mushrooms for instance) is a much more controllable trip. The most important thing is not to be afraid. With psychedelics, the only thing to fear is fear itself, as corny as it sounds. If you are in a positive mindset, you will have a good time on most any psychedelic, guaranteed .