I am very impressed with the quality of this product... all elements of it.  While attempting to put together an add-on not sold by Black Mountain, it was necessary for me to price out some of the parts.  I honestly do not see how they can sell a product of this quality for the price they are asking.  I also had occasion to call their customer service and found them to be helpful way beyond my expectations.  I need it for a rotator cuff injury and it is working out perfectly.  Five stars.