I bought and used one for Landon once. It was when my dad passed away and I had to fly out with Landon, then 4, Casen almost 3 and Hayden just 4mo...it was just me and all 3 boys going through the Denver International Airport to the DFW airport, 2 of the busiest. I had Hayden in a carrier, Casen in a stroller and then Landon with the backpack leash and all of our carry ons. To me it was a safety thing, I didn't have an extra hand to hold his and that way no one could come between us because it would have only taken a 2nd and someone could have been gone with him and I wouldn't ave been able to do anything. Other than that time through the airports it's never been used again with any of the boys, other than circumstances like that I don't like to see them used and have never had a need for them and Hayden is one stubborn independent toddler lol. I just don't really like them but felt I really needed to use it at that time