In my experience, and beleive me, I've done A LOT of acid, it's WAY easier to have a bad trip on acid. It's synthetic, rather than the natural high of mushrooms. You can never tell how high the dosage is or how concentrated the batch was. Not like mushrooms, where you can measure out an amount and just about use that as a reliable indicator of how much you're taking.

Personally, I'm never doing acid again after spending four hours arguing with my closest friends, storming out of the house and finding out I'd been absolutely silent the entire time, while everyone else had been chatting away, tripping balls.

Bad stuff. Real bad stuff.