my water situation may be a little different, I have a community well water system (which the community monitors) so it doesn't have lead or chlorine.
But the kinetico tech guy for 6 years, I talked to this morning (now a coworker) said that it does remove lead and doesn't increase corrosion or salt content. He said that if you're concerned about the salt then use potasium chloride. He also said that water to your home (unless contaminated by you own water system) is not allowed (by the city) to reach the levels of lead that nashville dept of water have to deal with anyways. (but that's him and not me)
All I can speculate is that it does what it is supposed to do, becuase all the apparent effects (like you said cleaning and soaping and stuff) hold true. There isn't a reason for me to believe that all the non apparent claims are false (or the affinity to lead leaching is true). Before you venture off getting a system, ask a butt load of questions. I'll try to do the experiment sometime but I guess I would need a lead tester to test the amount of lead in the water. If it works on cleaning our laundry, ourselves, so why not our cars. Whatever once made our laundry yellow is what I want when cleaning my car (or at least my miracle towels.
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According to the provided theory it works great at cleaning, just not at drinking which was the question to begin with correct?