Link to WD/Vudu offer:
As I have seen with a new unit which I recently purchased the unit performed an automatic firmware update as soon as it was activated. The bonus code appeared on the home menu tab. I logged in to a pre-existing account at Vudu and entered the code which gave me instant $15 cr toward rent or buy tv or movie. Had no restrictions. Write this code down as soon as it appears,
On other forums Vudu staff have replied "Please call us if any problems and we will manually issue it". I am not aware of any restrictions on the offer for refurb.