Hello!
We use a GAC for our autistic DS(8) when we are at WDW. He cannot sit and wait for an hour for Fantasmic! to start, like many people do. We arrive about 15 min prior to the start and are permitted to sit in the reserved handicapped area at the very top (back) of the arena. Great seats and you don't get hit with the spray! Fantasmic! is one show where front and center is NOT a great seat! We like to stay close to an exit in case the loud noise or fire effects upset him and we need to leave early (never had to). Another perk is that we can beat the crowd out of the arena at the end.
Have fun!