I've been using my Singing Straws for a few minutes each day for about a week now, and I do believe I can already tell a difference in tone and decreased tension in my voice. I have a history of nodules so I'm always striving to decrease as much strain as possible. I was surprised that it actually took some practice to achieve the same accuracy with arpeggios and scales that I have without the straw. I've been able to use that as another measure of progress - being able to maintain accuracy as I move down in straw sizes, which is also translating to improved accuracy without the straw as well. I have a re-audition for my chorus coming up in a few weeks, so I'll be curious to see how much of a difference my director notices!