From what I've found, LSA is more like a sacrament, with balanced stages. First is "hell": you'll be more nauseas than you've ever experianced, and your head will feel like it's going to explode. Next comes what I call "heaven": intense euphoria, but you won't always get this stage. Next is the trippy stage that is most closely related to LSD's effects, along with the unique thinking that LSD can cause. And I call this last stage insanity, because your mind will be stuck in thought circles and you'll be thinking extremely fast about things that wouldn't normally make sense. With that said, I think it's worth it to try once, because it is very similar, but very different than acid. However, don't expect a clear positive/negative trip. Peace
LSA is just as good as LSD, although you will get the nausea for about 10 - 20 minutes and with LSA the visuals won't be as intense. But after that get ready for LIFT OFF !
LSA is similar, I've never heard of LSA flashbacks either. LSA doesn't cause nausea, but some ways or preparing seeds do. When correctly done (even a simple water extraction) it doesn't cause nausea. I'd prefer LSD but I can't find any and this is cheaper. Lsa can still be way cool/intense too.