The best way I could describe it is that it's more powerful than weed but less trippy/scary than acid.
It's a pill.
I'm not sure where you could find it (I just took it one night at a friends house) but when you do, take it as soon as you get it-goooood shiiiit.
I also recommend eating as much as you can before you take it because it tends to have a tendency to temporarily remove your appitite.