I think you are mistaken. The zapperplans zapper is anything but pale in compairason to other units. The others are big, buky, old technology, harder to use and much more expensive. Zapperplans zapper on the other hand is easy to use, small, much more advanced technologicly (very sturdy, by the way) and fairly inexpensive.
Just search through curezone and look at all the people being cured using their zapperplans zapper!
I'm sure all zappers probably zap parasites just fine. But for my money I prefer the easier to use zapper that costs a whole lot less.
Oh and by the way, I've been zapping for five years now.