Yep tried it a few times the leaf stuff is rubbish and waste of money, 15x and 20x extract is wicked you need to pipe it or bong it the effects are a crazy vivid trip that lasts about 5-10 minutes most times i've experienced a feeling of shaman like visions which seem to explain the meaning of life being like the turning of a page or that I was being squashed into a corner of the room and the entire world was becoming compressed, with this stuff you need a ground controller to keep you ok or you might get up and fall about.
not for the faint hearted.