I'm prescribed the same thing as you. Concerta, Methylphenidate, Ritalin.. they all are the same thing. My thoughts on it are it's cool if you have some stuff to get done, but overall, if you're taking it everyday, it really sucks.
It makes you sweat more, you lose your appetite, you aren't as creative, you pretty much feel like a shell of a human whose only purpose is to do mindless tasks -in a nutshell, it's legal, time released cocaine. Honestly, I can't believe they are able to prescribe it the way they do either. I have access to almost any kind of ADHD medication and dosage that I want, as it's completely trial and error prescribed medication. So pretty much, I walk into a med checkup, and the doc will ask, "Is this one good? Do you want more or less than you received? Ok, lets see how this works"... and then I get it.
It's set up to be abused (and to make money), and that's what is going on. In my opinion, it's not healthy to load up on it everyday, even though that's what the bottle says to do. It sucks to see that there aren't any alternative options to those who have severe cases of ADHD, I feel like different learning settings aren't put to trial as they should be. Instead, after 'failing' the test, you just get meds.
My advice to anyone who has severe ADHD, and cannot even sit down to do the simplest hw assignments after a day of concentrating would be to get on a schedule. Eat a healthy breakfast and lunch before and during school/work/whatever, and make sure you are working out regularly. Burning off energy and knowing what you need to accomplish each day is a must if you do not wish to take the meds everyday.
It's a whole nother story as to where the drugs go after they are prescribed. Concerta is one of the most abused over-the-counter drugs in the U.S., and it's mostly by students.