Bold statement...
One I'll stand by. I'll happily show anyone how to use it properly, and I'm yet to meet anyone with a brain that can't use one.
Well the group I go with, both ferrets and terriers, none of us are stupid but none use the mk3 because we think there shite, and we've bought and used 2 diff sets, we just don't like them, tho I still have the collars,