Go ahead and book them. We just got back last night from a stay at FW and used both FP options. It was extremely helpful! At first, the FP+ system was frustrating as there were some glitches, but being able to use FP- made up for it. And as for the people who call this "double dipping", this is not breaking any rule or being greedy. We were speaking with some of the cast members who run the FP+ kiosks, b/c the app was so bad and they want to know what the FP+ users are doing and if they are still depending on the paper FPs. I know speaking with cast members is about as dependable as the rumor board around here, but from the different people we spoke to all giving us the same information (and you know how rare that is) I would be confident the the paper fast passes will still be around for your January vacation. They still have a lot to fix before FP+ is where they need it to be to be the only option.