What the bat is made of has little effect, the team found, as the calculations for aluminum bats did not differ significantly from those for wooden ones. (scientificamerican.com)
The downside to the fact that aluminum bats work better than wood bats is, apparently, a dozen million dollars or so in damages, if you are the bat manufacturer. (lawyerist.com)
I still believe if you make good pitches, it wouldn't matter if they were swinging aluminum bats. (si.com)