pz, It all depends on your skill level! For MOST shooters, you will never be able to tell the difference. It is NOT a marketing gimmic as straighter shafts DO add to accuracy BUT most of us don't shoot well enough to see or tell a difference.
I see this is your first post, how long have you been shooting? How good are you (really)? If you are a beginner, just get the arrows you can afford, don't worry about whether they are the "best" you can find AND SHOOT them. For hunting and 3D, and the associated distances your form and consistency will have a MUCH larger effect than just buying "better" arrows.
Arne