Provigil

I hear that Provigil is prescribed off label for ADD. It seems that there is less of the coming down that can be experienced with Adderal or Dexedrine. I stay sleepy much of the time from shift work and really tell when I am between doses of Adderall. I actually can sleep better when on Adderal than without it but my energy really crashes between doses.
Does anyone have any experience with Provigil? How does it compare to stimulant meds when used to help with ADD?
Thanks