A year or so ago, when components were in very short supply, I had a chance to buy a case(5000) of Tula small pistol primers. I'd used some before, and they'd worked fine, so I grabbed it.
Either this is from a problematic lot, or I was lucky on the first thousand. I've had a bunch of failures to fire; most will fire if given a second strike, but some won't. I'd guess the FTF rate is 5-10 per hundred(didn't keep exact count, I forgot one of the rules)
Put this in context: out of the God-knows-how-many thousands of rounds I've loaded over the years, I've had one primer of American manufacture fail to fire(CCI); that's from small and large pistol and small and large rifle. So this rate is abysmal. The 'fires on a second strike' could be from the cups being really hard, but the 'won't fire at all' is something truly wrong.
They work for practice, but I'd never trust them for hunting or defense ammo.
I have to note that I've also used some large pistol and large rifle(boxer and berdan) Tula primers, not a single failure with them. Which makes me think this is from a bad manufacturing lot.