My son isn't on any medications. However my mother was taking this drug a few years back ( she has since passed away) and she hated it!
The change in her was obvious, she appeared out of it, she was I addmit easier to deal with/more complacent and such. But and its a huge but she said it made her head fuzzy, she was tired all the time, her speach was even a little slurred. Mum was taking this not because she was violent, she started to have hallucinations and to appear to become scizophenic (cant spell sorry) hence the intro to meds.
prior to all of this she was extremely intelligent and productive member of society. Complete personality change on meds though. I know a few (adult)people that have used this particular medication and all have said the same thing as my mother, all have hated it.
Personally I would stay right away from it and try anything or nothing else. More so because kids dont have the same ability to say what these meds are doing to them as an adult does. More so again because my understanding of aspie kids is that their ability to communicate what is going on personally within themselves can be greatly impaired.
These are just my opinions hope I didn't offend anyone.