Love the fit the comfort and the price, I am old and have arthritis in my ankles thees are great can walk a long time and stay comfortable. It turns my old pre-blue tooth car into something capable of working seamlessly with a modern smart phone. The exchange was very fast and easy to do. I got these for my future daughter-in-law at Christmas and she loves them. Otherwise, the shoes are great. You can download the installation pdf from the manufacturers web. if you pair with more than one host device, can be annoying, but chalk that up to Bluetooth sucking. 2hrs by myself. I am not able to get it to work with a KVM switch. The fantasy is just relentless.