The warnings are for a reason, but not for everyone. For example, I feel that Beck is really hard on that nice little garlic plant. I love it and it does not bother me. Love coffee too and drink plenty of it. I also balance it with green tea.
Generally, the electroporation idea id highly overstated but some people are more sensitive than others.
Just approach things cautiously.
Yes, there is a difference between Beck and Clark's zapper and even many so called Clark zappers are different from each other.