I agree, for a combination of convenience and economy the Silverado zapper wins. The Silverado also has the added benefit of using silver which is antibacterial, antiviral, and to some degree antifungal. In my opinion it is not as powerful or as fast as the handheld/footpad zappers but wins out for the convenience factor. The more convenient it is to use the greater the chance that most people will use it. The only other issue that some people have with the Terminator and the Silverado is that they sometimes leave marks from the metal interacting with the skin. A bit of wet paper towel over each electrode can be used to avoid this. For ultimate economy (handheld though) I will say that http://stores.ebay.com/Get-it-While-You-Can
has the least expensive, well made zappers you can buy for under $30. I have the Silverado and several of the zappers from this ebay store. The three freq Xtreme zapper is also a great unit at $60. Thanks for taking the time to post your observations.