I still have mine but haven’t used it in a lot of years (though I should give it a whirl since I’ve done therapy) Initially it helped but my brain quickly adapted to it. In addition whatever slight benefit it gave to my stuttering it hindered my hearing a lot. It was hard to hear other people and sounds as it distorted everything. I had it in my dominating ear and I found I was turning my head to listen to other people talk in my other ear. If you can get insurance to pay for it go for it, but if you’re paying out of pocket you might want to look into alternative options to alleviate your severity