My CPO is running out in March so I have begun doing research on this as well. It appears that a lot of members recommend a PPI from a reputable indy shop. This way you have a 3rd party inspecting it versus the dealer which may not want to notify you of any issues if they don't want to deal with them.
If i'm not mistaken, the brakes are based on amount of mileage and not necessarily "wear." Plus you would have to come to a screeching halt every time you hit the brakes to wear down 15k miles worth in 10 days lol