I was invited to one of these about a year ago. Got paid for our time, and actually pretty interesting. It was a table discussion with other owners, and for me most unique aspect was hearing how other owners used their timeshares. You get so used to people on TUG being very familiar with their options, and I was surprised to see many of these other owners had little to no clue about exchanging, etc.
The questions from the interviewers (a survey company hired by MVC) were very basic but focused on what we wanted out of a vacation, and hinted at the changes we are seeing now--"Would you enjoy shorter stays in urban areas?" etc. They do give you a chance to say what is on your mind, so if there is something you want to see or change, be sure to share with them.