I tried it, had 20 some odd rounds, but I have some kind of bipolar disorder. I can't really tell if it helped or not because of the cyclical design of my episodes. I did recover and later did have severe depressive/mixed/manic states. I did like being put under though.

The only side effect was I was foggy the days of treatments and memory loss (I had to use GPS to places I've been going to for years) which was temporary. It was overall much better than the side effects of meds, and if I were desperate in a never-ending depression I'd try it again. (I do kinda like going under though, but I might be a bit of a weirdo in that way)