How much do you care about sitting in a good spot in the center? If you want to be in the center and not to far up you would need to arrive about 45 mins prior to show time to secure a good seat. With your signature show seating you can wait until about 15 mins prior to the show to come and get a great spot right in the middle. For people new to the park and visiting during a busy season I would highly recomend the reserved seating as it will allow you to maximice your time in the park.