I know David Royer and have spent a good bit of time with him discussing his methods.
I have not participated in his classes, but I am familiar with them and I know people who have attended. I would say it is definitely worth the money if you want to position yourself as an IRA expert. That is basically the main thrust of his program.
His classes are expensive. If you can attend through an
FMO, he discounts for groups.
He includes coaching help with his system. I have been with him when he has received several calls from his students. He never avoided a call and talked through whatever issue they were having.