We also had an incident at Target where she would scream while she was in the shopping cart. But when I let her down to help me push the shopping cart (which she likes to do), she would also take off. She thought it was hilarious when I had to chase her down the aisles to try to get to her all the while pushing the shopping cart.
That is when I decided to get the harness for her. It is not like I don't pay attention to her and where she is at all times but it just gives me a little peace of mind that she can't run/hide too far from me. The one I decided to get her also doubles as a backpack which I like a lot. Now that she is a little older I don't feel like I have to bring my diaper bag with me EVERYWHERE like I did when she was younger, since she doesn't need to be changed as often now. So it is nice that I can stick some of her food and water bottle in the backpack and have her carry it.
Some pics of her with the harness while we were walking around our complex last month.
What do you think? To harness or not to harness?