We went by on multiple times on Tuesday and the CM said, "Sorry, opening August 15", so we left. Came back later just to check and it was open. DH and DS went on and loved it. DH doesn't really like rides but said it was awesome.
I am the ride fanatic but chickened out because I don't like spinning rides. Well, DH and DS told me I'd have no problem, so I took 2 Drammamine (just in case)and we went back on Wednesday at 4:00.
They tell you repeatedly that the ride is not for everyone --- believe them! The ride was not for me. I definitely felt the spinning and was nauseous for several hours afterward. Just for comparison's sake -- I ride Star Tours, RNR, Back to the Future and all of these rides with no problem.
One thing that we noticed - we checked the front of the building multiple times during the day to see if the ride was open. Maybe this doesn't mean anything but up until about 3:30, everything was staionary out front, but after 3:30, one of the planets was spinning. Is the spinning planet a sign that the ride is open or about to open?