I have never cooked one worth eating.  I have spilled the contents while serving.   I have dried them out which I really did not think was possible.  I have served them awfully rare. 

Yes, many people are successful with them but I will probably never try to cook them again. 

You know that chicken thing, you slice the white meat thin, put some stuff in the middle and roll it up then bake or fry?  The inside was cold, the outside burnt dry as the sahara.   My Wife looked at me like I was trying to kill her.