It seems legitimate enough, but I've never purchased anything from such a website. When you say "trip," I guess you're talking about taking the "psychedelics." Know that you're not taking ecstasy, psilocybin, or LSD, but potentially dangerous psychoactive chemicals. Erowid has these chemicals classified as research chemicals, as not too much is known about them. Of course, the products will be pure and unadulterated, but be careful with how much you're taking and exactly what you're taking.
Wow. Some interesting stuff out there, certainly. If it does work, it's pretty unique. Let me know if it works out for you.