I wouldn't change plans just for Mistify, but it's a good little show and a pleasant enough way to end a day at SeaWorld.
You pretty much have to get to the Waterfront about a half hour before showtime to assure a good seat.
There are, essentially, two duplicate shows that run simultaneously, each aimed at a different seating area. Large "screens" formed by walls of sprayed water out in the lagoon are used to projected films of underwater scenes while on the soundtrack a boy tells of his dream of searching for Shamu in the ocean.
Accompanying this are water ballets, if you will, performed by water spouts, some of which are very high. Then there are fireworks.
The best effect is the last when white fieworks shoot out from the top of the Sky Tower like spokes on a wheel. Cool.