Often breaks and/or requires a complete reset. The app itself is a bad idea. Everyone going through the park trying to do stuff on their phone now. Bad enough without EVERYTHING having to be done through the app. So windows mentality. Reboot (or uninstall and reinstall) fixes everything, right? It's not just me. There a running joke about Disney IT from those of us who know how IT *should* be done and many others who have to use products that work maybe 60% of the time.