Honestly, it didn't work for us, either, but I'm willing to try again. He loves to wear it, but we didn't do a trial run until DL. Once he had it on, he took off like a shot! Until he hit the end of the leash, whereupon he stayed, legs still pumping and arms flailing around like a dang helicopter!
When he realized this was how it worked, he got

, and so Daddy put him on his shoulders. However, Daddy won't be along, I can't carry him like that (at least not very far), so he's going to either have to be in the stroller or we use the backpack. And if he throws a fit, he goes back in the stroller.
Mean Mama!