I tried DAF way back in 2006 when smartphones werent available yet. They cost an enormous amount of money and I had to wear a bulky device in my pocket and very visible earphones. Suffice it to say that the public embrassment I felt from wearing it dwarfed the benefits. People thought I was insensitive wearing earphones while they were talking to me and I got tired explaining. Thinking about giving it another try now that technology has advances.