I only had one experience, but it was fantastic. I bought a used Cronus Tactical spotter, and the coating was flaking a little bit on the inside objective. Sent them the scope, had a new one in less than a week. No questions asked.
The only experience I had initially bothered me because I got no communication that they received my warranty job. A week later a brand new scope showed up in the mail. No questions asked. I’ll not complain