I thought it was so cool when I got my first pair of velcro shoes as a kid. I kept opening and closing the straps to make the sound over and over. The main unexpected problem I had was that they can fail in the winter. After slogging through deep snow for a while they straps would slowly come undone and the velcro would trap frozen snow in the thousands of tiny hooks. Then you have to do a funny shuffle walk back home to put your shoes by the heater and let them thaw out.