Has anyone used these and what is your opinion of them?

I am trying to tune them and they are hitting low and to the left. My thunderheads are right on and my field points are shooting bullets through paper. Any ideas on what I can try?

Thanks

So I guess no one is using these?

I have tested them. They did fairly well in the tests. They are accurate, and hold up well enough. I found them to fly as well as any quality fixed blade head. I suspect your problems are in the bows tune, or your arrows.