"Great Fun if You are Open to It"
I would recommend it to friends that are open to ZEN, Learning, or Music. This type of fiction adventure to share mystical concepts, which can be helpful or even important life lessons, can be very powerful for those who are ready for them and can be a serious turn off for those not ready. It isn't something I could recommend without knowing the other person well.
Way of the Peace Warrior by Millman. The Music Lesson is much more light hearted and uses the learning of Music as its focus. But both books use adventures with a mystical "teacher" to lead the "student" on a journey of learning.
Listening to this story with friends that don't quite get it but are open can lead to interesting discussions. Just remember to be kind and loving with your friends. Let them pick up what they can use and don't push anything they can't handle.