... I have Verizon, so your mileage may vary if you have another carrier, and I generally had decent internet while I was in the parks. That said, there were quite a few areas where either network saturation or dead spots kept me from accessing the
Disneyland app. For many rides, I had zero connectivity while in the ride queue, which is where I'd imagine you would want the ability to book a FP most. I did watch for Disney wifi availability as well. It was very spotty AND it's an open, unsecure network which is personally a deal breaker for me. I'd rather see them secure the wifi and have you use your ticket as a password, or something to that effect. I realize that is just me being an IT guy. I know most folks will willy nilly connect to any free wifi to save on data because they don't know the risks. That said, even if you were willing to use their network, it wasn't very available. Maybe they're working on that, who knows, but given what I saw there would be zero value in MaxPass for me.