Looks good to me.
The company has a A+ rating with the BBB. Approximately 1 complaint a year, and all resolved.
They have a 90-day satisfaction-guaranteed offer along with a 3-year warranty.
I find the patent (6325942) credible. It says water molecules, being polar, join around the metal ions and keep them from contacting each other. If you can bust up the cells of water, the ions will bump each other, join, and no longer be "sticky."
I know that principle works because chlorine bleach or peroxide bleach can last months in the bottle as long as the water keeps the bleach particles from colliding. If they collide, the chlorine bleach ions turn into salt and water, while the peroxide bleach ions turn into oxygen gas and water. Your bleach went flat.
The patent says the invention agitates the water molecules with a magnetic field at the resonant frequency of water molecules. I know that works because a cup of water gets hot in a microwave oven.
If I had hard water, maybe I'd fill two bowls. I'd make soap lather with the first bowl. I'd put the other bowl in the microwave a few seconds, then see if soap lathered better.