Very poor installation instructions caused me much time and frustration. Once the first one is in, the hook is held in place, and you can easily screw in the second anchor, and youre done. Keeping it on our boat. The sensor tracks well and even in wireless mode (havent bothered with Bluetooth) its smooth and didnt miss a beat. The older I get, the more comfort matters to me. They?re not completely ?no-show,? you can see the top of the sock just a little bit with the sneakers that I wear. I ordered the 7 regular. I dont like that they dont have the squishy ear buds and doesnt block outside noise at all. I got the size 11 and find them to be just what I needed. You will NOT regret it!