It seems a lot of the opinions are from people that have never used the machines, I have been using them now for a few years and am quite happy with the results, and am on the second machine. I am not trying to promote a certain brand but can confirm these systems are not for shorted batteries or damaged cells, just to eliminate sulfation in a quick efficient manner with out adding anything to the acid and without creating a huge amount of heat and battery damage. most of you are completely correct to say that the best way to prevent the sulfation is to service the batteries correctly, unfortunately no one ever does, and that keeps us all in business, just like properly servicing a forklift will help prevent breakdowns.