Opinions will vary on whether you got a good deal. Grinders will say you paid too much - my feeling is if the vehicle has been good to you (must have been to buy it out) then you made a good choice.
On the maps - I have never updated the maps on my 15. I did update the sync 2 to sync 3 and now use Google Maps exclusively for the navigation needs. If you actually use the sync 3 nav then it may be worth it to you to update the database. My feeling is the updates are not a good value since they cost too much (my opinion) and are essentially outdated - even the most recent updates are at minimum a year behind. Google Maps is free to use and is the most current data you can get. Even portable nav units - most of them provide lifetime updates are better options.
On the maps - I have never updated the maps on my 15. I did update the sync 2 to sync 3 and now use Google Maps exclusively for the navigation needs. If you actually use the sync 3 nav then it may be worth it to you to update the database. My feeling is the updates are not a good value since they cost too much (my opinion) and are essentially outdated - even the most recent updates are at minimum a year behind. Google Maps is free to use and is the most current data you can get. Even portable nav units - most of them provide lifetime updates are better options.