I've been a professional musician for more than 45 years. I'm a trained singer and have been successful in many facets of the industry. Over the last 20 years I've been a casino headliner. I put incredibly high demands on my voice and have a strict schedule of vocal workouts balanced with gigging. We all know SOVT exercises can be frustrating, finding the right one to create the proper amount of back pressure isn't always easy to figure out. I saw this device in my feed, and I have to say I was skeptical. It seemed like a simple device that was overpriced. I kept seeing it in my feed however, and after reading all of the great reviews I decided to pull the trigger and get it. Boy was I pleasantly surprised. When used correctly, this gives a full range of air resistance that Make SOVT exercises more of an exact science. I'm very happy I made the purchase, it now travels with me to every show and has been integrated into my vocal workouts. Kudos to the creators of this device, the ease of use and thoughtful design make an invaluable tool for singers, I highly recommend it! ChrisCosta.com