I've taken something very similar to adderall (it's a methylphenidate, where as adderall is an amphetamine) all my life due to ADHD, and I can say it definitely increases your attention. You'll also have more time because you won't waste it doing stupid things...like sleeping or eating...
But seriously, don't get dependent on it. I've seen the side effects, and I wouldn't wish someone to bring that upon themselves it could be avoided.