We will be using the same source as HIFI Simulations, I think REX get it from a different source.

 

Great news. HiFi has been able to recreate and aid a well planned flight, and I think using the forecast data helps with the sudden wind shifts. I have never experienced a sudden wind shift during a flight in AS2012- only REX.

My experience with REX has been pretty negative regarding their weather data and implementation. Their textures when used with their data is very well done. But the overall data and how they inject it is pretty bad.