There have been threads concerning this product in the past.
I did some research and I am convinced it's snake oil. I checked some of the sources listed on their web site and found them either anecdotal, false, or non-existent. One university study they cited actually said the product didn't work.
In addition the following info can be seen at this
Site.
"The Consumer Reports in 1996 tested an over $500 magnet water treatment device. Two water heaters, over a two-year period, had over 10,000 gallons heated. One was "treated" with the magnetic treatment and one was not. The water heaters were cut open, and the tanks were found to contain the same quantity and texture of scale. There was no difference according to Consumers Reports.
Note: Those who claim any product will solve all water problems used to be called a "snake oil salesman." You, the consumer, must do your homework ... and "buyer beware." We repeat ... we have NOT actually seen physical evidence, "proof," that any brand of magnetic water "conditioner" works."