Fantasmic! Reasons?
1) Relaxing way to end the night at the parks since you can sit in ampitheater waiting for show.
2) If you don't feel like waiting in line,look into the dinner package. Last time, I think we bought the Hollywood and Vine Buffet Package(all you can eat) for about $18 per adult(??) and made a late lunch/early dinner out of it. Prior to that we packaged dinner at Mama Rosas which was also good but the package was more $$ I think. Then you can go in the rear entrance about 30 min before showtime and don't have to wait in the regular line which sometimes lines up about 90 min before showtime. Check with the guest services at MGM as soon as you get to the park since these packages sell out quickly at times.
3)Mmm, Beer! I can't speak for everyone but after a harrowing day in the Florida heat mediating trivial sibling conflicts and rushing arund the parks, a tall,cold icy draft (bud or heineken available in the rear of ampitheater) is most refreshing. Enough said.
4) Leaving MK after the fireworks (if you choose to watch after Spectro) is a mob scene. With only one way to leave the park and many, many, many people rushing for the buses after the finale, its easy to lose your crowd. If watching with young ones hold on to their hand tightly. We had a group of five(3 adults and 2 children) and nearly got seperated and crushed several times in the crowd. For some reason, crowds exiting after epcot and MGM shows are more dispersed when leaving. We would never stay at MK to watch the fireworks again, besides you can watch fireworks anywhere.
.............I hope this helps..................