Jim,
It basically replaces your outside air-cooled AC unit with a water-cooled one that uses the pool's water for the cooling. It is supposed to work really well but has me wondering:
What do you do when your pool is 95 degrees and you don't want it any warmer? Does the AC cease to work in the house? This unit seems to augment your current AC units, making them more efficient. If it actually works, and TOH really recommends them, then the only issue is cost and what you actually save on electricity.

At least one statement in the ad is misleading. Since you have to run your pump whether you use solar or the AC to heat your pool, you won't save electricity costs on running the pump. It will be the same.