I'm also a slingshooter and found my way to this sport trough Dankung. I have tried several models and rubbers but nothing works as good for me as the "Black Eagle" along with 1842 tube rubber. The Black Eagle has become my absolute favorite slingshot and is always either in my pocket or my EDC bag and never with less than 50 steelballs 9mm. I found the 9mm to be a perfect balance between speed and weight (at least for the 1842 rubber).
cheers