Federico Cesarini's bridge is nothing short of amazing.  It pulls a fantastic sound out of my cello.  It is incredibly responsive.  I hear notes with such immediacy that I find I am able to play passages with great ease which previously were very difficult.  It must be experienced to be understood.  It's almost as if the instrument is electrified but without the loss of any of the quality or gentleness of a standard bridge.  I am thinking of using it on all my instruments.  I cannot recommend it highly enough