Perplexed, we found that the non-stimulant meds have much less of a sudden "Wow, different kid" effect than the stimulant meds do. But that's what works for our kid-- at the right dose, it's quite tremendous.
Verona, kids with sleep issues or who are already underweight sometimes don't do well on the stimulant meds (which can change sleep and eating patterns). A kid with aggression issues (toward self or others) may not do well on the stimulants, either-- this is highly variable and our doc tries hard to look at the whole kid very closely before deciding on a drug. We use a developmental pediatrician, not our regular ped-- I like having a prescribing doc who really, really knows these meds inside and out.
HTH
DeeDee