This is 100% true. Same buddy, we went to a range and they didn’t want him shooting steel cased (not steel CORE which i understand makes a mess of the backstop). I loaned him a case of my brass cased ammo. He shoots at another range that I also frequent and they’ve never had a problem with steel case. Both indoor ranges, different rules.
My one buddy is the only one I know of, and he says it runs 100% in his Glock. If you read around online, you’ll find one crowd says “if it’s worth relying on, it should eat anything” and the other crowd that says “sure run it if you want to ruin your gun”. For me, I don’t shoot enough where the cost difference is worth it. But if you shoot a lot, or are under a stricter budget, I’d say give it a shot (hehehe) and see if your gun likes it.