I still shoot aluminums out of one longbow. They happen to fly extremely well out of this particular bow, so I'll use them until they're gone. I've pretty much switched to carbons for one reason. Weight to stiffness ratio. Carbon allow for a much higher FOC, which has been demonstrated to be valuable for increased penetration.

The switch to carbons has forced me to make a spine tester and to spend a lot more time tuning my arrows. However, when I'm done they shoot very well.