Bach Visualizer Trumpet

As a seasoned player, I've never been happy with my trumpet embouchure, and recently set about fixing it, following expert advise.
The visualiser has helped me to resolve poor mouthpiece positioning, and after only a few months, I can hear - and literally 'see' the difference.
Being able to see what's going on behind the mouthpiece has been invaluable, and given me confidence that I'm on the right track.
The tool itself is easy to use and well made, as you'd expect from Bach.