I have/had one. I never wear it. Biggest waste of money ever. Although, getting it and trying it for a month or two showed me how annoying it is and made me realize what ridiculous lengths i was going to “cure” my stutter. I think that’s when i realized acceptance was easier than having something in my ear all day everyday. Also, delayed and altered auditory feedback only works temporarily. Like anything else you do, you adapt to it and start to stutter again.