I have been using the Cardio Canine for almost 4 years now with my two Border Collies. I use the two leash set up and absolutely love it. I have no back problems, am more in control of my dogs and having my hands free to run properly makes the difference between running with and running without my dogs. I have tried many different 'around the waist' dog leashes and this one is far superior. I can see this lasting for many more years. The quality is superior to any other product out there and the customer service is phenomenal. If you have dogs, and you walk or run with them, this is a must have product.