I work as professional dog walker and this system is wonderful.  Hands free walking, and really great for dogs that pull. No stress on the arms, pull is on center of body, I just stop, bend my knees, and the dog isn't going anywhere.  Highly recommend this product.  You can get extensions, for the long lead section, and I'd recommend getting some extra clips (the piece that clips onto dog's collar).  They last a long time, but I give the clip a lot of daily use, and after quite a long time, clip will loosen, but I'm talking about after several hundred walks.