I used to occasionally take concerta when partying back in college. It had a horrid effect on me. I could stay up until 5AM and just POUND beers, but it gave me wild mood swings. For a period, I would love everyone. Hugging strangers and having really deep conversations with people I barely knew. An hour later I would be completely depressed, hungover, and waiting for death.
It's the worst drug I've ever taken, and that includes some illegal ones that I choose not to name.
I tried Adderrall a couple times too, and it wasn't nearly as awful on my state of mind as Concerta, although the hangover was bad.
The lesson: don't take this stuff unless you're absolutely sure you need it. Its basically legal meth. All my friends who had ADD and had prescriptions for the stuff got off it, after it totally wrecked them. They all developed bad smoking habits when they were on it, and would just either drink to complete excess or smoke a ton of weed in attempts to get to sleep, but it just had rebound effects that really messed them up.
I'm not a fan, even for people with ADD. There has to be better meds for that stuff.