The quality is on par with the US, and in same cases better. Overall it is better imo.
You end up spending up to 50% less money for the same quality but many Korean clinics also have more comprehensive aftercare that is included in the total cost. Things like lymphatic massage, scar treatment, and stem cell therapy can be included in the package which is amazing. You will be hard-pressed to find this sort of thing included for free in the US!