Yes, the info is don't listen to people that walk up to you and offer obviously bad info.
The Al in the Blazer is an alloy that is tougher than pure Al but it is brittle. You don't have to worry about it damaging your gun. I have heard rumors about Blazers splitting or having head separations, but as far as I know they are only rumors. Someone else might have some hard data on this. However, the way I see it, a company like CCI could hardly afford to manufacture millions of these rounds per year if they caused damage to a gun.