I love breatcontrolleres, i own a midified Yamaha BC3a which is amazing, tough physically ending end of live...
Keep in mind tough, that breathcontroll is nothing but a midi parameter 0 to 127 that can be controlled by breath pressure...
Huge advantage, it works very natural, but the same effect can be archieved with any modwheel or expression pedal.. just make sure it triggers the same parameter as the breathcontroll