I too have heard of a couple of people who have had occasion to use GT and 124 NATO...........only one complaint, which was from a dude center punched three times inside 60 yards who lived a long, long time after despite not being given emergency care due to continued engagements. We would learn later that two of the three rounds sent multiple fragments into homeboy's ticker. ER & cardiac surgeons both stated they had no explanation for why he had not expired within seconds of being shot, and his heart was not functioning properly, and should have shut down, given the extensive damage. Neither expected him to make it through the night.
He was released from the hospital about 2 months later, and last I knew, was still alive and kicking. In a savage country's prison system.
Everyone else I have heard of were plenty impressed enough with NATO spec ammo.