Thanks for that info Jim.  I've been reluctant to buy one because I had my doubts they would actually work instead of just being a sales gimmick.  Now I think I'll buy one.  We usually run a hot on offsets on traditional 4 barbed fence as "insurance" when cattle get too close to the fence as grass gets short and crops get taller.  Tumble weeds and antelope often give it a twist and it is hard to find the fault in a hurry.