The only one I regularly use is MDXX. I've tried acid, would do it again but never run across it. Pot I've tried twice. Once I got so unbelievably stoned I basically fell into a half asleep half aware daze and eventually just passed out without ever getting the infamous munchies. Other time, barely got buzzed. Both times my friends were having an awesome time with it. DXM I've tried... don't really like. I'm thinking of giving it one last go, but I'm not sure. Shrooms were a cool add on the time I hippyflipped, would like to try them alone.
Most of the rest I wont touch due to the greater addiction potential.