To test this project I got a dozen volunteers to use the vest while blindfolded and some of them listened to loud rock music.  They did not have any direct collision when put into a maze of obstacles.  They all took about a minute or less each to learn how to use the vest.  So it is very intuitive.  What is directly in front of the sensor is displayed on the belly and the peripherals are displayed on the left and right portions of the back.  High objects can be determined from low objects because of the 4 rows of motors.  Higher objects are on the higher rows and lower objects are on lower rows.  Soon I will try the vest on legally blind people.