I've never used one on my dogs, never would either, but tbh I have seen the effects that they can have on dogs that have been "unruly" so I'm not anti e-collars I just choose to put in more time in the back field using more conventional and traditional methods. I think e-collars are banned here now in UK anyway.
"never argue with stupid people, they may drag you down to their level and then beat you with experience"..Mark Twain
Ruby's d.o.b. 21/6/2011,,Lyharr Grouse Shot d.ob. 7/01/2015