The jury is still out on these. Do they work? yes. For how long? Can't say. Are they as effective as ion exchange? Maybe. Are they around the same price as Ion exchange? Not from my supplier. Do they have to be maintained? Yes. How often? Depends on use. In short, maybe someone here has more experience with them than I do. I have installed about a dozen of the Watts units which are similar in theory and design and thus far......they have been ok but then again, they have not been in very long and they are not installed in locations that have horribly hard water either. When the media is full, it has to be replaced and it's not cheap and neither is the labor to do it so....... I guess that I will tell you that unless your city is telling you that you can't use salt regen then I would go with tried and true Ion Exchange. It's been around a long time. It is understood and proven technology and it is probably going to cost you less in the long run.