I had a course of ECT as antidepressants didn't help. I was concerned about memory loss and so self monitored my intelligence and memory - the hospital didn't bother.
Not only did it not help my suicidal ideation, but because it didn't I felt there was one more thing I had failed with and then with the brain function deterioration which I had evidence of; there was a second thing to add to my worries.
Would I recommend it? Only if really desperate and be aware it may make you worse