Simple to install.  Xpand also has  several videos to walk you through the process.  You can adjust how tight the laces are when you install them.  I had mine too tight at first but rectified that with a 5 minute adjustment. I have put these in my running shoes and they have worked great.  I also have them in a pair of casual sneakers and my yard work sneakers.  I am very happy with them.  My shoes have stayed in place until I decide to take them off.  I probably will not put them in my tennis shoes because of the amount of side torque required to play tennis.