Also remember, you get a $15 Planet Hollywood voucher with your WDW package. You can use it to order an extra app or whatever that's not covered with your DDP.
We decided to go for a snack rather than use our DDP credits that day. We had 2 $15 vouchers and were allowed to combine them. We ordered some food and apps and even one of those light up cups for my son. I think the only limit was no alcohol. We kept our purchases within $30 and our only OOP was a generous tip.
The food was excellent and my kids really enjoyed the unique atmosphere.