There are more powerful zappers that work faster and more efficiently with handheld copper pipes and footpads. What I like about the T2 is you wear it and go about your business as it works. With the other more powerful units you are tied to the pipes and footpads. So which do you think woulld get more use if you had the choice between the two? The one that is easiest to use. Nuff said. Hopefully this covers your other questions if not you might want to email Don at doncroft@wildblue.net