I had 15 sessions of ECT six years ago. I was because my other option was to go to the state hospital for long term care and that scared me more as I had been in the state hospital for adolescents and it was horrible. My depression was super severe and I had attempted suicide. The ECT Absolutely worked. I lost a lot of memory though. Forgot people's names from high school and how to get around my home town. I don't remember the hospital stay at all. But the actual treatments were not so bad and it worked so well that if I ever got in that situation again I would absolutely consider it.

I do agree you should try all other avenues first but when I was basically dead from depression and ECT made life worth living again.