They are going to be the equal or superior to any other cup and core bullet out there that isn't made with special design such as tapered jackets, bonding, other mechanical means of holding the core in place.
Take any base product bullet from any of the big american companies and sierra will be as good or better. I'm not going to make any statements about overseas or bargain things other than money matters to those people as well. The lead will be scrap, the copper may be dodgy, the QC and equipment may be poor. You may have every possible failure. The next round may be good. Cup and core from the big american makers will still be as good as can be made.
I once bought a large box of nosler "seconds" in 180 grain .308, and it took me almost a dozen of them to find the flaws. They were wrinkles at the tip. It's very doubful that accuracy would be ruined, and with an exposed lead peplat, it's doubtful that expansion would have been compromised. The cores couldn't have failed, it's a partition. You can expect to lose your front core sometimes whatever partition you use if you have the velocity too high at point of impact.
I wondered when I started looking at them, in the days before automation, how did they even manage to see those little wrinkles?