I've actually done this experiment before, and knew what to expect. Treated wood usually sounds a lot better than untreated one. And this case is no exception. The arm probably sounds as good as my quick-and-dirty design allows.
It's sonically in the middle between the steel tube
and CF prototypes. Bit less attack and slam than steel armtubes, bit less transparency than Prototype 6
— but perhaps more balance and an altogether more enjoyable listen.