Vyvanse is effectively time released Dextroamphetamine (Dexedrine), which means it has the mental stimulation and euphoria of Adderall's Dex-amp, with none of the "tweaky" or "speedy" side effects of Adderall's Levo-amp.
It is Lisdexamphetamine, which means that it is slowly converted in to Dex-amp over time in your body. It won't give you a rush, but it will definitely give you a long lasting high. 30mg Vyvanse = 10mg Dexedrine, and 70mg Vyvanse = 25mg Dexedrine.