The Eides are well-respected amongst communities for 2E kids, children who are gifted but also have LDs, ADHD, autism, or other neurological problems. It seems that if they are taking these results seriously, they are probably something worth looking at.
http://eideneurolearningblog.blogspot.com/2009/04/adhd-drugs-no-long-term-benefits.html
http://eideneurolearningblog.blogspot.com/2009/04/adhd-drugs-no-long-term-benefits.html