My son had a diabolo that wasn't tripple axle before I purchased this one for him, and now he is pulling of spin tricks and some really funky tricks you couldn't do on a fixed axle diabolo.
The quality of product is great, the wheels are a flexible, but firm, rubber that endures every type of knock (5-6 meter drops onto concrete, etc...) and the axle is metal with plastic. The product is top quality and for the money paid its well worth it.
On the education side of things, its helped me explain to my son about gyroscopic effects.
My advice would be to buy a fixed axle diabolo first then progress onto this to truly become a master with a diabolo.