I did a two week over-training cycle, these last two weeks actually. Not because I was trying the super accumulation program I read on this site, but simply because I had lots of motivation and lots of free time. This week was national vacation (china), all my friends were out of town, so I had nothing much to do.
After two weeks I will say this.
I added 3 pounds in two weeks, AND I look more cut, lower body fat i believe.
But I am depressed, my moods are rock bottom, I am only happy in the gym. I have no energy to do anything, except lift, eat, and read books, watch movies. I sleep 10 hours a day and still feel shitty all day. I don't feel lucid, I forget things constantly. My muscles are constantly fatigued (tho i enjoy this is a masochistic way).
I believe i made the best gains I ever had in my life in these two weeks. But this intensity can not be maintained along with a real life, classes, work, having relationships, etc. I don't recommend it unless you don't mind alienating all your friends
So, in response to the OP, I did train until depressed and I did grow, and I don't really want to do it again. ha