I'd have to say that lays things pretty well out there. Didn't you once mention though that she tends not to respond to these? I might mention something about that if this is the case.
I remember writing my H a similar letter once (which I never did give him) in it I remember referring to the fact that he had acknowledged that there was a problem and that he would fix it but that his course of inaction only led me to feel that my feelings and needs and our marriage were unimportant to him.
