I remember a discussion I had with some of the JLC watchmakers, and they told me that it was all about fine setting of the balance wheel. For example, in 2009, at the Chronometry contest, JLC trusted the first two places.
The Master Tourbillon won, and the Reverso Gyrotourbillon 2 was a close second. Yes, the simple tourbillon won!
Food for thought.
Still, intellectually, a great watch, this Berhoud.
Nicolas