I would consider this one of my best buys for my dogs.  I initially bought it for biking with one dog at a time and it is perfect for that.  My younger dog will occasionally pull and having her connected where my weight is centered she does not pull the bike off balance.  When I'm biking in particular I like to use the BrilliantK9 vest because I think it's gentler and safer for the dog than using with the collar and is designed for an upward correction.  Anyway, the Buddy System Dog Leash has made biking easy and safe for both of us.