Have self improvement seminars "improved you"?

I took the Dale Carnegie course years ago. I went from being very shy to being able to talk in front of a group.

I attended Carol Reynolds seminars (in NV, AZ, UT) and felt depressed and alone shortly after. I don’t feel they had a lasting affect, but I did for the most part enjoy going to them, even to Challenge.

Have you attended either of these and how did they affect you – positively or negatively or not at all?