Oppenheimer works best for very advanced learners who can follow fast and complex English. Some conversations move quickly, so learners may need to listen to certain parts more than once at first. Learners will hear plenty of useful natural English, but some lines may still require a second listen. The narrative adds extra difficulty because learners need to track events, motives, or character relationships. If your English is close to C1/C2, Oppenheimer can be useful for getting used to faster spoken English.
