We had quite good luck and got them both times we tried at 7:00 am. The first time we got boarding group 26, which was called about 9:00 and was almost a walk on. We only waited outside the building for about 5 min before we entered and went into the pre-show area. The second try we got group 5 and basically our group was called about 5 minutes after park opening. We walked straight through again. Full disclosure, we had 3 competitive teens trying with us each day and they were always the ones successful, lol! The line later in the day got LONG LONG and we were so grateful to have gotten on early in the day. We stayed at GCH and used both hotel wifi and our Verizon LTE with success. In our experience, early boarding groups were the way to go.