It's an extremely hard drug for anybody, ADHD or no. Adderall / Vyvanse is prescription meth[0] (something I've heard from several of my AD(H)D friends). If the pros outweigh the cons for an individual, great; I wish them the best. But while I can't find the research I remember to back this up, it's looking like long-term medication with amphetamines may be ineffective or harmful.
EDIT [0]: Yes, I know that that prescription meth literally exists under the name Desoxyn, that is not what I mean. See https://news.ycombinator.com/item?id=5321949 and https://news.ycombinator.com/item?id=5321935 .