I bought a dozen maple shafts from Paul Bruner (Screaming Eagle company) abut 25 years ago. They looked like a pile of snakes when I received them, I straightened and straightened but they had a mind of their own. I finally got a few straight and found that when shot out of a bow they had a mind of their own as well, straight, perfectly spined and they often took off high and wide of the target.
I still have one I footed with a Reparrow, it flies just so so.
I am sure there are better quality maple shafts out there than what I bought so many years ago but my first batch soured me on maple.
I bought a dozen poplar shafts from Paul as well, these were much worse than the maple, completely unusable. I have since traded for some mighty fine poplar shafting from other dealers.