I havent had the need for one. I several very close age gaps and a SN DD, and dont see a point. The stroller works, and they have to hold a hand at all times.
I dont think they are incredibly cruel, but leashing my kid just doesnt seem like something I want or need to do.
Katie, mom to Olivia (97), Veda (98), Franky (2004), Wendy (2005), JoHannah (2007), Thea (2009) and Sunny (2011)