I was once (several years ago) the taxi service for a dear dear friend who was type II bipolar and repeatedly hospitalized for suicidal ideation and attempts, serious cutting, the whole nine yards. More or less as a last resort, they convinced him to try the shock therapy. It was outpatient, he just couldn't drive right after. He didn't feel too hot right afterwards (nausea etc) and I think he had a little short term memory loss .... but there were no serious side effects. It's hard to say what actually sorted him out, as he was also on about a zillion different meds and seeing a very good counselor ... but today he is about as functional as any of us; great job, good friends, learning new things, and about to celebrate his 15th anniversary.
The outcomes can be very good now, although it certainly does sound terrifying.
"Show me a completely smooth operation and I'll show you someone who's covering mistakes. Real boats rock." -- Frank Herbert