The correct way to do it would be to put them on an arrow straightener or some sort of jig with a good dial indicator and check them for run out in several different spots.

If you are using an arrow spinner and can see any wobble at all they are way off from what they should be.

Be sure when you are checking them with an arrow spinner that it is the arrow not a nock or insert that is off. However I have seen MANY carbons that were not straight, right out of the box.

Will you notice it? Depends on how well you shoot and what you are doing. For 20- 30 yards with field tips, maybe not unless you have excellent form. Now put a fixed blade head on it and it will be quite noticable if you try to tune or group them. Also the amount of fletch and FOC you have may make a difference as well.

The biggest thing is if the arrow is not straight, especially a carbon then chances are the spine is not correct either. One of the most important things in shooting accurately is having well matched arrows. I love it when I see someone spend 800 on a bow, then a hundred or so on sights and another 100 on a fancy drop a way rest. Then they buy 50-60 dollar El cheapo carbon arrows. None of those other things will actually effect how well you shoot, where your arrows will.

Paul