I have and so has a friend of mine who's child is on it.
I just took Will off of it and I'm hoping this behavior will go away soon.
It was great for the first few weeks and then he started having temper tantrums.
my daughter has been on it since december. although initially everything was really good, her anxiety levels and ocd are getting to be too much for her. with only three weeks of school left i don't know if we should go back to the focalin or just hold it out. My daughter has also displayed emotional issues as well. bad tantrums and such.
i didn't notice aggression as a side effect and interestingly anxiety was not listed as a marked side effect of their clinical trial.