Has anybody here tried DAF (delayed audio feedback)?

Has anybody here tried DAF (delayed audio feedback)? I've been stuttering my whole life, I just tried delayed audio feedback and I talked completely normal and fluent. You can probably try these online, and if you have an Android or iPhone/iPad/iPod you can search "daf" or "faf" in your app store. Plug in your headphones with a mic and give it a go. (Isn't it so weird listening to your own voice?) There are also devices that you hook up to your ear for this, but they seem to be horribly overpriced and using an app has the same effect. This is not a permanent solution I've heard , as people tend to get used to it and start stuttering again. I think the problem is that people get dependant on it, and freak out when they can't have it. I think the key is to use this as a tool, not a solution. Use it to get used to speaking in front of people (with a Bluetooth headset or headphones with a built into microphone you can do this pretty discreetly). There's something about listening to your own voice that tricks your brain into not stuttering. Use this to your advantage. It will help you realize speech is easy, you don't have to constantly think about how you're going to say the words. Perhaps you can try exceises where you talk for 2 minutes with the DAF, then 30 seconds normally. As tome goes on, you can slowly reduce your time with the DAF. You will have to work at it, but I think it is possible to get good results with this. This is the one that I currently am using, its free (Android) https://play.google.com/store/apps/details?id=de.jurihock.voicesmith