I have seen the bow rest used on the knight and hale hunting show and I made my own prototype from two forked tree limbs just to see if it would improove my groups. Has anyone used there product?

I have the rest you are talking about.
I have found that if I start getting bad groups shooting without the rest, I can use the rest for a couple rounds and my form improves right away.
I think it is very helpful if you tend to drop your bow arm.
I have not yet hunted with it.