It really depends on who you get as a guide. I believe that
DVC wants your guide to be the ones described as a person that will answer questions for you, that is your main point of contact if you have questions about your membership (not reservations or accounting or something, but just membership)...which ours is. If we have a question about our membership, they will answer it or find the answer for us. Even if we have a problem on site, my guide will help follow up to make sure that it was corrected, he is a carreer Disney cast member and was not hired as a DVC sales person, like many of the newer guides.
Unfortunately, they have gone to hiring a lot of sales people from outside of Disney and stuck them in the guide positions. Especially in the Doorway locations, some of the guides may have little knowledge of WDW or DVC as a whole. Our Guide is not only a salesperson, but also a member....he is upfront and honest with all of his answers. Now, that doesn't mean we didn't have to ask questions, you can't expect someone to cover every possible scenario and you will always learn more, but he didn't use false or misleading information to get a sale. We do get a voicemail anytime we go to WDW wishing us a good stay and he was great with our add-on, but we don't have a lot of contact outside of that.
So, next time you are at WDW, it might be worth stopping in and talking to your guide. You might find that you have someone you can use one day for questions or concerns. It is nice to know that there is a real person that I have met that will help follow up at WDW when there is a problem, he could actually stop at a resort and not just be making calls or sending emails!