According to Zooka Sports, the pitching machine housing is made out of the same stuff as football helmets, so it is line drive-proof as are the legs.
That said, there is an orange adjustment knob that sticks out every so slightly on one side that could theoretically be hit and the orange ring at the end of the tube if hit the wrong way could break. And, of course, if for whatever reason, the machine was flipped around backward immediately after a pitch and a line drive hit the display, it would break (not sure how that would ever occur).