I've loaded some Blazer Brass in .45 ACP and 9mm with no problems so far. I even tested one lot (.45 ACP) by reloading it and shooting it 3 times. No problems! Test Pistol was my older EAA .45 Witness. I also reloaded that lot again (4th load) and it's on my supply shelf.
The only cases that have caused me any problems have been the "Amerc" brass from some American Ammo I bought some time back. Some cases wouldn't fit into the shell holder, and the primer pockets are pretty loose after the initial firing. I picked up a few cases last time I went shooting that were marked Federal 07 on them, and the primer pockets were swaged real tight, and I wound up chunking them. Also watch out for the Winclean?? cases that have the small primers in them.
Haven't had any brass cause problems in any of my guns, but I picked up a bunch of range brass a while back that had what I think was Israeli made brass. Shoots fine, but the primer pockets are very tight. Makes the priming sequence a little spooky, so I avoid those. WWB no problem.