Since buying and building one of the very first Kadet Seniors on engines ranging from an open rocker Saito 30 to a Saito 100, I have yet to make a cloud of balsa dust. Dirt cloud at ground level but they hold up well.

Seen more 3D planes blow up than practically any other type. They do not seem to like fast at all.

Favorite engine on the Sr Kadet was the Saito 62 that was on longer than any other during its 30 or so year career.

That Saito 65 however is a lot stronger than You may realize . It is also infinitively smoother and more durable than the 62. A very robust, sturdy workhorse.
Run it once and you will see what I mean!