I ate about 3grams of them and tripped my balls off.
It started out good, laughing my ass off. Then colors started shifting - no big deal, I've hallucinated on DXM and Diphenhydramine (mildly) before. Shit got a little intense for me when I started hearing marimba music coming for my walls, but I was enjoying it. When I peaked though, I saw clown faces in the wall and ran into my bathroom to calm down. Then the entire floor started shifting and moving and looked almost like the static you see on a TV. Super intense. The walls started "breathing" and patterns I looked at shimmered (IE, if I looked at a polka-dot pattern, the dots would slightly change size and color). It was really cool, but I couldn't handle it.
Ended up going to the emergency room. They gave me sedatives and made sure I hadn't eaten poisonous shrooms. The hospital was actually kind of fun, but it was mildly embarrassing when the nurse came into the room and asked what was wrong...
"Well, I took a couple of grams of mushrooms, and now these medical gowns are a part of me."
Did much smaller amounts twice after that, wasn't too bad. Haven't done em since, I'm not into experimenting with drugs anymore.