I picked one up at Babies R Us that looks like a pink purse. It straps around the waist and across the chest messenger style, and then you can choose to add the "leash" clip on or not. DD thinks it's a toy, and doesn't mind wearing it at all. Plus, she can carry around little trinkets in her purse.
She darted away from me in Target the other day, through a little area in the isle where I had to move some stuff out of the way to catch up with her. She got a pretty good head start, and she got out of my sight. She ran down the next isle (unbeknownst to me) and then doubled back. I wound up running down one end of the shoes while she ran at the other end of the shoes. She ran, giggling, and never even looked back. I couldn't get to her until we both bottomed out into the clothing section. I was so mad, I was spitting fire. It was more than a little scary. And you know? Lots of people saw her get away, and dart off, and NO ONE stepped in to stop her. I've seen that happen in the store before, and I'll usually step in front of the little one and try to delay them until the parent can catch up (without actually touching them if possible), but everyone just watched.
Anyway, sorry for the novel. My point is, we're SO taking it with us. And it'll probably go everywhere with me from now on anyway, just in case she needs it. I could really give a flip what other people have to say about it. She's a runner. She'll bolt if given any opportunity. It keeps her safe. The end.