'IMO' the Parts Plus having a 90%@20um efficiency is an extremely generous efficiency speculation. Based on known data points of other Asian oem manufactured filters, if I were to 'speculate' I'd say more like 50-65%@20um. Agree that like the newer Federated oil filter and others with the same coo, China, the majority appear well made. This one is no exception at 5k mile oci. I'm just not willing to use the halo effect based on the construction alone to project an equivalent high efficiency number on the filter.
That said, wouldn't necessarily keep me from using one. Especially when I think of other similar comparable filters used by quick lube and indies, and the noted Asian oems on the road. Though wouldn't likely be my first choice, for a 3-5k conventional oci it seems a decent option.
Perhaps some day they will publish an efficiency rating so speculation unnecessary. Until then, 'construction looks good, efficiency unknown' most I can say.