I have never heard of someone having withdrawal symptoms from a prescription dosage of Adderal. I've kept my ears open for one, since this is an exceptionally common anecdote that someone's heard from someone else.
If you have, please point to a source - there's a lot of anecdotal FUD running rampant throughout this thread.
It sucks there aren't any good meds for addiction treatment for stimulants yet (naltrexone/bupe etc).
Quitting meth, cocaine, prescription stims is really really hard.