We have nothing but issues since it started and it isn't getting any better. When it does work, we have the most issues with dining reservations, though FP's and general uptime are issues too. With dining, we consistently have issues getting the right number of guests on the reservation. Same with room reservations. My opinion is that Disney should put priority on getting My Disney Experience app working 100% correctly since they want guests to use it and are basically 'required' to use it. Forget worrying about apps for playing games in the parks, get the IT people working on the right things.