baby walking harness

so moms am I wrong for wanting a baby harness? my daughter runs off every chance she gets! we live in a crazy town and my mom says only dogs belong on leash!! how many moms use them and are they worth the money. UPDATE: thank you so much for all the advice! you're all right safety is most important! my mom is "old school" now I'm stuck on which one I should get! help me out. As another mom said the book bag looking ones look more friendly. And another mom said how she put snacks in her son's awesome idea:)! please help me choose