From what I understand, you get to keep your DVD, just have to send in the PoP, and they send you a coupon for $8 off the BD. Why not go for it? Especially since Disney BDs come with DVDs in many cases.

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris