For me it was like dropping acid, minus the incoherence and cramps. I was driving to work and suddenly the world was really *interesting*. The traffic lights burned bright, the moire patterns from two chainlink fences caught and held my attention, the air was thick like a rioja, the drizzle beautiful on the windshield and delicious on the tongue. I've never enjoyed pumping gas into a Pontiac at 7AM on an overcast day in suburban sprawl kiddie corner to a shopping mall so much as that morning.
Unfortunately or fortunately the overt effects wore off. I've tried going off it, but I drift into miserable crabbiness when I do. I seem to respond to going on and off it very quickly, which would suggest placebo effect, but I suspect I have a slightly overamped metabolism.
-- Andy