Herters dies, like all their products, was very popular at one time, and much less expensive, than any of the other brands. Opinion was about divided, you either loved them, or you hated them.
I know at least one person, who has used Herters loading equipment, including dies, for years and years. Swears by them. I think they had some mighty fine rifles with their name on, also.
I once bought dies for my 243. First ime I set up the sizing die, I had the decapper and neck expander too far extended. The handle of the press went down normal, pushed out the primer. But the handle raised with difficulty and when I got the case out, I discovered the neck expander shaft was bent like a wet noodle.
I returned them for RCBS dies.