I take Vyvanse (Lisdexamfetamine) every day for ADHD, and I can testify that it’s a lot more tolerable (to me at least) than Adderall. Adderall made me feel like I was having a manic episode.
Okay, ignore for a moment that I’m posting this at work instead of working… 
There are physical and mental effects to taking amphetamine, that last until the drug wears off.
Vyvanse gives me a dry mouth, especially when I talk, so I have to keep a cup of water on hand at all time. (Adderall was much worse for this.) It reduces my appetite to the point where if I’m not careful, I will only think to eat when I start notice I’m shaking/nauseated. The Vyvanse I take is not an extended release formula, so it wanes by the afternoon, and I have to make sure to do any work requiring concentration and persistence in the morning. At the same time, I have to take the pill before 10 am in the morning or it will keep me awake at night. For the first 1-2 weeks of taking it, I felt jittery and light-headed when doing any kind of physical activity (even walking down a flight of stairs).
Mentally, Vyvanse gives me motivation to do difficult/boring tasks and the ability to stick with them. At work this summer I am responsible for planning and implementing a months-long, multi-step project, by myself – it’s involved coming up with solutions, breaking them into steps, prioritizing the steps, planning the steps chronologically, having to accommodate new data and re-do past planning, etc. I can tell you, I would not be able to do this without medication. I would have immediately become overwhelmed by the enormity of the task and gotten frustrated with some roadblock early in the process and quit. Or I would have been on step 5 when I realized I hadn’t taken into account these 3 things I should have done first, or had forgotten them, or had gotten stymied on a step and never progressed. Vyvanse gives me the energy/motivation to work on the project and a mental clarity and persistance to continue working on it.
There are disadvantages. Right now I’m illustrating one of them – if my attention gets sufficiently distracted away from my main task onto something equally engaging or stimulating, I will focus intently on that instead. I’ve come to think of my attention as a hunting dog on a leash – I have to be careful what direction I point my direction in, because once it takes off running, it will run and run and run.
(This is also a symptom of ADHD itself, called hyperfocus. The difference – at least for me – is that when I’m unmedicated, there are only a few tasks which will cause me to hyperfocus. For example, I can play video games and feel like only a few minutes have gone by, when it’s actually been 6 hours. When I’m on meds, I will hyperfocus on whatever task you put in front of me.)
If you’re asking about addiction potential, I can’t speak to that. I take this medication under the guidance of a psychiatrist, we have periodic check-ins to see how I’m doing on it, and I don’t have any other substance abuse issues.
If you have any other questions, feel free to ask.