Starting meds - positive results?


I just picked up my first prescription for stimulant ADHD, Metadate, and am optimistic.

Online, most of what I read focuses on side effects.  I am well-aware of these, and am now interested in hearing from those with experience in stimulant meds some of your positive experiences.

On successful prescriptions:

How long until it kicks in?  Will there be some instant lucidity, or does it come slowly as we repeat doses?  What does a positive result feel like?