Benefit: Durable arrows don’t break due to normal use, whether or not they hit their target; unless the arrow goes missing, an archer can retrieve and reuse a durable arrow again and again. Durable arrows can be broken in other ways (such as deliberate snapping, hitting a fire elemental, and so on).
Drawback: If crafted with magic (such as bane), the magic only lasts for one use of the arrow, but the nonmagical arrow can still be reused or imbued with magic again.