Korean springs are regarded as better manufactured than Chinese springs.
The range of weights allow for more versatility not offered by switch manufacturers. Allowing for highly customised keyboards, tailored to each person's liking.
However, where as Cherry switches are measured in grams at actuation force, these springs are measured in grams at bottom out force.
That means that a 67g spring is heavier than a Cherry Red or Brown spring.
72g springs are likened to vintage black springs, which are highly sought after switches.