Ferber method

Have any mommies out there used the ferber method of sleep training or “graduated extinction”? If so at what age did you start it and how did it go?

(Please don’t jump on me for asking. If you liked it or hated it please say why instead of freaking out)

Context: my son is 4 months and ebf, and only ever has slept about 2 hour stretches at night. Not necessarily saying. I’m going to start this now or later I just would like your thoughts and experiences