I have heard it on several occasions, and I have also performed it on a recital. It is a really interesting work, derived from a simple two note theme (D#, E#). Its minimalist in nature (something I really like), and is a lot of fun to play. It has some pretty significant altissimo requirements though... after playing the whole piece, you have to soar up to an altissimo E#, which is tough endurance wise.
Get Kenneth's CD and give it a listen.
Steve P