I was using it before I switched to a smokeless muzz. If I were to go back to BP and BP subs BH209 would be the only powder I would use. It will still cause corrosion but you don't have to rush to clean after firing like BP and BP subs. No build up while shooting, it creates a sooty film so no swabbing between shots. Because it is a extruded powder it is very consistent from load to load. You could measure your charges by weight if you really wanted exact charges. It does not absorb water like BP and BP subs.
What's not to like about it??