I will tell you this. I forgot ours on this trip and although my runner is doing better, he still took his opportunities. It might have been chasing a bird or just for the fun of running. It might have been the few times I figured, I would not buckle him into the stroller because we were only going a little ways before parking it again. I wished Id had it for the crowded situations when he wasnt in the stroller. It wasnt a big deal in open space, but I wished I had it so he would not have been able to take off and dart through a crowd of people. Im chasing and saying excuse me and it could have been my imagination or the situation, but it felt like people slowed down or got in my path while I was chasing him. And of course you cant touch anyones child these days so no one stopped him. So much for that if Im lost look under my bracelet tag he was wearing. People just watched him run and gave me bad looks when I was chasing him. They would probably have preferred he was in a harness. He ended up walking more on this trip than planned because of the wind from TS Debbie blew the stroller cover off on 3 different days. Most of the time he was great because of the progress we have made in this area, but I wish I had it.
You can teach and teach and teach and punish and punish and punish. That has worked with other things. This particular thing for us has only improved with maturity. My son does not see the difference in running from me in our yard and running from me in a crowded place. Hes getting there, but he isnt there yet. The thing the child has to hold on to, hed just drop it and take off if he really wanted to. Every child is different even with the same parents. My daughter stayed with me and I never would have needed one with her. My son is just totally different.
People can say whatever they want. If your child never ran off, great. I know what that is like. Like I said, I had one that never ran off. Now I have one that does. But he also sits well in his stroller when he is in it, did 8 TS meals during out trip, sat well on the plane and on the Disney transportation. Running is just something fun for him. When I use the harness, he walks right by me. There is never enough of a lead for him to trip anyone with it. My son has a good life and a dang good mom despite his puppy harness.