Well I've only been visiting this forum for a couple of weeks, but I so far have not seen Parazapper saying anything about lifestyle change one way or the other. I would agree on the lifestyle change thing of course too, but PZ seems to be saying something more about the quality of some of the chips and not if they make the battery last longer.
In any event, obviously both zappers work. But I would like to and will try out others, including PZ's at some point.