In my eyes, this is the best way to beat the rope drop crowds to the most popular rides, such as 7DMT, as well as get to experience MK without the normal crowds. It's really an awesome experience. Even without pre-ordering, we were in and out in 25-30 minutes max, and still had time to walk around, take pictures, and ride 7DMT several times before the park even opened. If you take advantage of the pre-order option, I can imagine it being even slightly less.