The towline is well made, the hook and the closure of the wrist strap are stable.
Every now and then is the line, if you want to keep them but sometimes shorter, somewhat impractical since you the entire 10 meters only once "roll up" must - but it's also a towing and no furling. ;) All in all I'm satisfied and my dogs are happy because they now have a lot more freedom of movement when we are traveling. ;)