I personally don't see the need to switch. I have had great results with T7 - great accuracy, velocity and no crud ring problems. Cleanup is a piece of cake. But everyone's experience may vary. If I had major crud ring issues, I would consider switching. But I also can get T7 a LOT cheaper - like $14 for 16 oz during the after-season sales, as opposed to $30 for 10 oz BH209 locally. But again, if you don't shoot very much, it may not be a big issue. I don't shoot a lot now, but I'm still a cheap-o at heart .