I use it to focus more and energy. Sometimes I feel the tiredness on the afternoon. And take another 10mg IR if I need to. I don't get the euphoria some people are talking about but it seems to work for the lack of energy I have due to another medical issue. Is 30 mg XR that much different than 40 mg XR and what do you think about taking the 10 mg IR in the afternoon? Never felt a CRASH I don't think.