I have used ones I made myself. The only real downside is they are trickier to align to get a true spin. The ones I made were made out of knife steel, heat treated, and I omitted the tang. They attached by holes cut into the blade. Depending on the make they may be prone to bending at the tang if not heat treated.
They are some beautiful broadheads and arrows for sure. I definitely like how you made with that file, That's shows true craftsmanship my friend. I had a friend of mine that swears by them but he also said they can be time consuming. I am thinking of trying some myself.
They work fine...for bears I'd forge them to 300 grains.