I can't seem to find any information about these except for the product manufacturer. Does anyone have experience with this product? My husband has been put on a salt free diet and we need a new softener anyway.

The best thing is to check your local water softener supply company. They can assist you on your quest.
Stay away from the units that use wires wrapped around the main water line as it enters the house and sends electrical pulses into the pipe to remove the hardness. They simply do not work like there supposed to. What they do is break down the particals within the water makeing them smaller thus makeing the water appear to be soft. It works ok as long as the water flow is slow. But turn it up and the water flows much to quickly through the pipe for it to work. They do have larger syle systems that work on same principle, but you would need to get them through a water softener supply house.

There are a number of reviews and suggestions here: http://www.allwaterpurification.com/salt-free-water-softener.html I don't know who is running the web site but they don't seem to favor any one particular brand over another. I would still take their advice with a grain of, ahem, salt. There is a very wide variety of opinions out there on these systems. Several I read questioned whether they worked as advertised, or even worked at all.

If you have a well you need to be carefull if you are looking at a carbon type filter system. These larger type systems can hold radon in water. The carbon will hold any outgassing of the radon and once the carbon has been depleted and requires disposal. Its considered radioactive and requires special disposal.
I have heard of these systems and those who have them have been pleased.

I googled this and got if off a site called hometips.com

Some people are concerned about the health affects of the sodium that softeners put in drinking water. Be aware that most health concerns are over intake of sodium chloride, not the sodium bicarbonate that results from softening water. In addition, opinions expressed in the New England Journal of Medicine minimize concerns about the amount of salt introduced by water softeners.

Although the amount of sodium added is minimal compared to a healthy person's normal diet, people who have been advised by a doctor to reduce sodium intake may want to consider a unit that regenerates with a potassium chloride salt substitute rather than sodium.
Another option is to bypass one or more cold water faucets in the house that are used for drinking water. Some people connect a standard unit only to the hot-water side of the water supply system; unfortunately, with this choice, you forfeit all soft-water benefits in the shower, laundry, and wherever else cold water is mixed with hot. Another option is to install a water filter that will remove salt for drinking water.

A more radical—and controversial—option is an electronic or magnetic water softener. According to manufacturers, this plug-in device, which clips onto the incoming pipe, sets up a magnetic field that changes the electromagnetic properties of the calcium carbonate minerals so they are repelled from pipes and each other.

A study commissioned by the Water Quality Association, however, found that, when such devices were tested against conventional ion-exchange softeners and against their own claims, no significant physical or chemical changes in the water occurred and the units did not reduce scale formation. Despite the effectiveness claims given by manufacturers of these devices, buyers should beware.--Fishfool @ The Reef Tank