I've taken Adderall, Provigil (Modafinil), and Ritalin/Concerta on and off for the past couple of years for the treatment of ADHD w/o hyperactivity. Recently, I've noticed Shire is marketing a new (yet another) ADHD simultant-based medication "Vyvanse". What are people's experience with this drug? How does it compare to Adderall? Please, only respond if you've taken this drug.