I have implemented a few surveys for my clients, and love the ease of using the feature. However, when it's time to send a reminder to those who have not yet participated in the survey, I'm not given the option to modify the reminder text. I found out that all the system does is send out a duplicate of the original survey invite e-mail--including the subject line.
What I'd love to do is be able to modify the reminder text. For example, I'd love to be able to say something like, "Don't forget to take the survey" or "You only have three days left to participate in our survey" or "We haven't yet heard from you...and we value your opinion!"