Completely reliable. Very comfortable to hold and very versatile. It allows you to have different lengths of lead so that you can put the do closer or let him have more freedom depending on where you are walking. The best feature for me is being able to teather to posts outside shops etc so easily without having to take the lead off the dog. When i take my freinds dog for a walk too, i dont even need an extra lead as i can walk two dogs using this. I would never go back to using a normal lead now. Highly Recommend
For training puppies it is ideal and its even possible to clip two leads together to give a longer line to work on.