I find it best to know *EXACTLY* what I am going to request prior to my phone call to my guide. Sometimes, I do question their honesty. My first guide pushed Old Key West and, after several phone calls, I actually gave in. Fortunately, when the documents came, I came to my senses and realized an OKW purchase would not be fitting for my needs. Disney reassigned me to someone else, who reviewed my family's vacation history and "encouraged" a VWL purchase.
Needless to say, my recommendation is that you know what you want and stick to it. The experience can be analogous to buying a car. If you are not fully aware of what is happening and asking the right questions, you may end up with something you do not really want.