(carbon arrows)are very durable (unlike some in the early days). But the best reason in my mind, is that they are always straight!
This is the sort of information dispersed on forums that, unless challenged properly, people take for gospel. I've even seen it in magazines and recently showed the author the err in the statement "always straight." The author printed a retraction and gave me credit for "setting me (him) straight."
With aluminum, they may even look and test straight but can have a slight bow to them. With carbons, they are either straight, or broke.
Whether it be aluminum or carbon, either may "look straight". 'Proper' testing will give you correct data on both straightness and spine.
Any arrow selection chart will have to know cam type, poundage, weight of field point/broadhead, and draw length.
Arrow charts are ONLY an indicator of what you need in an arrow. Proper selection, as Paul indicated, goes way beyond what the charts dictate. Proper tuning and advanced tuningafter proper chart analysis is the best approach for choosing the 'right' arrow.
If they are reputable, their first concern will be to answer your questions and not to sell you a bunch of stuff!
This statement leaves a lot to interpretation.Many people, regretfully, think thatthey can go into a PROShopas an unknown and ask a lot of questions without buying anything. Theproblem is that PRO Shop owners get inundated with phone calls and 'drop ins' all the time with nothing but questions. Sometimes they get 'hardened' by this approach and automatically through up 'walls'. After all, it's their livelihood and they, like otherhard workers, have to feed their families. I'm not saying that they won't or shouldn't answer some questions, but there may be a limit to their benevolence.