I have an Outsville Hammerhead on my BK Rush. I like the way it breaks, but it doesn’t hold chalk well. I have to hit it with a tip pik all the time or I have a good chance of miscuing. 
I’d like to try the new Taom break tip (I presume 3.0) if they ever get them out. I’m also curious about the new cuetec break tip - I don’t know anyone who has one yet.