fluid type for A-518

has anybody here ran the new dexronVI in the A-518 transmission? or heard of people running it? I dont know if its true or not, and am not saying it is, so ill just share with you guys what i was told by a canadian transmission builder.
This canadian transmission builder told me that he uses dexronVI in the A-518s and even the 47rh and 47re and 46re transmissions with lock up. According to him there is no better atf on the market right now, let me re-phrase that, according to him dexronVI is the best atf out off all the manufacture made transmission fluid.
He told me it has the best heat handling ability and that it flows the best when hot or cold and that it protects the best??? I myself have not heard of too many people running dexronVI but i guess there are a few people out there who swear by it in the 727s and A-500 and 518s and 47rhs an 46res????