We did a similar program. Customers received a gift card for completing the review, and accounts teams received a spiff for reviews that came in through their personal link. It was based on a program that Jacqueline Gu shared with me. In my experience, incentivizing the accounts team really made a difference. We have very high-touch account teams, so customers felt that they were doing something to support their rep, which was more compelling than just the gift card.