I've bought Adderall and Ritalin, as well as the flourinated research amphetamines (2-FMA, 4-FMA, 4-FA). Purchasing of the prescribed amphetamines was infrequent, and I had a binging phase with "research" on the flourinated ones.
I liked amphetamines so much that I convinced a psychiatrist to prescribe me some. I was aiming for Adderall, but I got Vyvanse. Vyvanse is good too, though. I took one daily. When I got fired from the job I worked about a year ago, I lost my insurance and couldn't get any more pills. Maybe I will use medical insurance at my new job to get more Vyvanse. Maybe I won't. I don't care either way, really.
What do I feel like on amphetamines? Energetic and focused, with an uplift in mood. They all have subtly different vibes depending upon their chemical structures. On certain ones I had a "crash" afterward where I felt sluggish and melancholic. I think mainly that was with Ritalin and 4-FA.