I can give already a comparenson between the chines brake and the bb7.
This is how I think about them.
Both brakes, brake good but with the bb7 you need less force. The Chinese brake works fine, but as you cary more weight or pull a trailer, I would advice the bb7.
Seting up is on both easy, but the Chinese ones are a bit easier. I need to try one thing, because they chained position, but I think that it was my mistake and not the brake.
I also prefer the look of the Chinese brake.
For normal use, the Chinese brake is just fine and work good, especially for that price.