They are inexpensive and seem to work as well as anything else I shoot. I shoot them a lot, because they are inexpensive and i love to rove and stump shoot, often taking "stupid shots" and breaking arrows.
They are probably not as perfect as others, but I can't seem to tell.
There is one thing I don't like about them and any black shaft. I see my hand and the arrow in my sight vision. I don't aim using it ( gap), but I see it, so a picture that looks like "this" is right for that shot.
In the early or late day, wearing my dark camo gloves, I cannot see any of it and it messes with my mind !