At best binaural beats are a crutch. Artificially inducing an altered state of consciousness makes you dependent on the binaural beats to meditate. An adept Satanist is capable of entering a trance state and doing everything else binaural beats are claimed to be able to induce.
At worst binaural beats can induce seizures, drowsiness, and other serious problems by detrimentally altering brainwave frequency.