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BBCOR testing actually takes composite bats, rolls them repeatedly until failure, and tests them along the way. If, at any point, they perform over the set limit, they fail. So these bats are "safe", if they're only rolled. You'll see the term ABI, or advanced break in, and that's what this means.
Ah, but the question is, are they considered altered? I've heard both sides of this arguement, but nothing authoritative.
Composite bats have a certain life cycle. They start out like bricks, loosen up over time and use, then go dead. Rolling will get you nearer the end of the cycle, where performance is highest. Also understand that it's that much closer to death.
If you ask any manufacturor, they'll tell you putting your bat in a vise will indeed void the warranty, so these guys are liars. Just on that statement alone, I wouldn't trust them.
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