I also tried it out after reading that LW post. At first it was fantastic at getting me to fall asleep within 30 minutes (I'm a good sleeper, it would only take me 30 minutes because I would be going to sleep not tired in order to wake up earlier) and I would wake up feeling alert.

Now unfortunately I wake up feeling the same and basically have stopped noticing its effects. The only time I take it is when I want to go to sleep and I'm not tired.

Also: During the initial 1-2 week period of effectiveness, I had intense and vivid and stressful dreams (or maybe I simply remembered my normal dreams better).