1. After only a few months of usage, 4 crocodile clips of the 2 wires connecting handholds and footpads are unable to close by themselves and the clips are so loose that they disconnect with handholds/footpads easily. Unfortunately, I forgot to read the fine prints at the time of purchase that wires and clips aren't covered by warranty (my fault).
2. Same problem (but less so) for the crocodile clips that are attached to the wires coming out of the main unit. I asked Ken Presner what I should do about this and he responded by saying, "You can secure them with rubber bands." I let you judge his product and attitude.
I am sure Ken Presner knew about the problem with crocodile clips. Yet he has made no remedy for this basic design flaw and has not warned purchasers of this problem, which is bound to occur within a few months with usage.
3. Ken Presner claims his AC adapter is of high quality. I can't disprove this. However, the adapter is made in China!!! How does he know it is of high quality if he has no say in what is being produced in the Chinese factory (he is just a negligible client of the factory unless he buys tens of thousands of AC adapters a year)? Worse still, he had the audacity to charge $39.95 for my international AC adapter, which he procures for only a few dollars at most!!! So much overpriced!!!
My conclusion: See http://paradevices.com/ultimate_zapper_cheaply_made.html
to get an idea of how much is being put into the product. Read the crocodile clip problem that I and others have and issue of overpriced AC adapter. Member Parazapper is right that UZ is well overpriced. The basic unit (without footpads) should be priced well under $99. The current price of $199.95 is robbery!!! In any case, the claim of UZ being the best zapper is very misleading, if not a plain lie and don't buy UZ unless the design has changed so that no crocodile clips are used.