It’s better than staying in and taking your chances, but not much. Coitus Interruptus takes will, control and supreme awareness of when ejaculation takes place. It’s also emotionally bewildering. She feels guilty because she’s depriving him of the full expereince, and she feels anxious for fear he will ejaculate before he withdraws. He wonders if he left before the buzzer. One can never be sure!
The best alternative is to make condoms part of foreplay. And after ejaculation, get out before losing erection, otherwise there is leakage. But at least the experience has obtained the intended conclusion.