I LOVE this product!  We have a newly adopted Plott Hound and she is a bit intimidating to some.  She has a big bark and unique coloring and has some anxiety while approaching other dogs.  With this harness people have been much more accommodating in their reactions to her behavior as we work with her in public since the harness makes the message clear that she is in the midst of a learning process.  It has also deterred people from barreling right up to pet her without asking which has made it much easier on us as owners to be able to introduce her to people slowly.  I don't clip a leash to this harness so I can't attest to it's performance in that area, but my dog has been able to wear this for 5-mile walks with no chafing or overheating.  Solid purchase!