This is a nice alternative to some of the other buzzing devices out there. The upside (to the upsound) is that the resistance is balanced to imitate the instrument. I feel it does this quite well. I also enjoy the sound reduction, which is helpful in various situations where a practice mute or open ended mouthpiece simply won’t work. In trumpet pedagogy in particular, the idea of buzzing devices is typically approached from a pitch matching standpoint almost exclusively. In my opinion, this is secondary. The primary benefit of using something like the upsound is to train the air to move smoothly and continuously throughout the range of the horn (as well as through musical phrases). The upsound assists in training this because there are no harmonic “notches” providing feedback that can be misinterpreted by the student and responded to by “bumping” the air. If you use this, practice glissandos first (as instructed in the pamphlet), then move to gentle, and finally more decisive pitch to pitch movement. You will reap the benefits almost instantly and improve your playing more quickly than on the horn and/or mouthpiece alone.