I am a professional musician and have been for the last 40+ years. I was a voice major while majoring in music at college. Teaching acoustic guitar (with a focus on playing guitar and singing at the same time) one of the features I offer is along with printed material I record what the student will be practicing and forward that to them as a sound file. Listening to those sound files in recent years I've noticed a significantly diminished result in the overall quality of my singing. Not as much volume, control of dynamics and I found myself straining to hit notes in the upper part of my register. This was scary and I attributed it to not exactly being a youngster anymore. Then I noticed an add for the Vocal Trainer. I admit I was more than a bit skeptical at first but hey, what did I have to lose? Almost immediately I noticed an improvement in my control over long passages. But at the end of two weeks (following the maker's many wonderful practice and application suggestions) I heard significant overall improvement in all aspects of my singing. The most impressive thing was that I was not straining to hit the higher notes in songs, so much so that I reintroduced songs to my repertoire that I'd given up on. Best of all, students, friends and quite a few listeners at gigs became very complimentary about my vocal performance, yeah!!! The device is easy to use but do adjust to the settings with more resistance gradually. My Voice Trainer comes with a great little padded case and it is required equipment before I do a show. I just keep mine in my car and on the way to an engagement I use it as I'm driving, sometimes doing a suggested exercise or two or "singing" along with a song playing on the radio. The result is I'm always warmed up and ready to take the stage. It is elegant in design and small enough to stick in my pocket. I'm not exaggerating in the least when I say my Vocal Trainer has given me back my singing voice. Buy one, follow the suggested exercises and I'd bet you will have the same experience.