I have used carbons (Gold Tip 5575) for a couple of years now, but I just switched back to aluminum arrows.
I' m shooting a much tighter group (might not have anything to do with carbon or aluminum?) and my bow is much quieter now.
For what little speed I have lost, I' ve gained a whole lots of quiet! You can' t shoot an arrow fast enough that a deer can' t jump it, but if he can' t hear it, he can' t jump it either!
I don' t think I' ll go back to carbons again!