ADHD
"I have been taking 30mg of Vyvanse for one week now. It works great. The first day I could really feel the amphetamine and found it too strong and unpleasant but on day 2 I did not feel bad from it. It lasts long, probably 12-14 hours and is very smooth. The crash is relatively mild.
Previously I have been on dexamphetamine IR 3x10mg/day for one month which worked really well, but I wanted something that is sustained released. Before that I was on Ritalin IR and LA for over 15 years. The Methylphenidate just did not work as well as it used to and I found the side effects more and more unpleasant. 
I can really recommend Vyvanse so far. I am really calm from it and can focus very well on tasks. It also has less cardiac side effects than others."