We had DS on Concerta when he was 4. Concerta is more "old school" but I think the idea is the same, well they're not exactly the same because the doctor explained the difference, but it was way technical and I can't remember it. We were also very hesitant.
What we noticed: didn't affect his behavior one bit. And then he quit eating. Like he was always pretty picky, but we were basically having to force-feed the child (and that's not good either) and he was living off of Boost. So. Two months and 10 pounds later, we quit. 10 pounds is alot for a 4-year-old, fortunately he was a chunk to start out. I think if it would have made a noticable difference, we would have figured out a way around the appetite problem, but since we couldn't really tell anything, why bother.
A BIG problem we had was that Concerta was capsules (I think Straterra is too, right?) so we were faced with teaching a 4-year-old with autism how to swallow pills. That right there took 2 weeks, and I can tell you how we did it if you're interested.
Now, we also have a 9 y/o w/ ADHD, and he is on Adderall. We HAVE noticed a difference with him. And I was also very hesitant- I had my suspicions about his ADHD since he was about 4, and we only got the diagnosis and the meds 3 months ago. (that's got denial written all over it, huh?)

However, it also killed off
his appetite until about 6:30 when it wears off. I would suggest if you decide to do it, go ahead and start pumping the kid with Boost drinks every day (the chocolate is yummy!).
JMHO.
