The only issue i have with Rex 2.0 is the weather system. when i load a random weather scene for example ( low front with thunderstorms and heavy rain) when i load the flight plan Rex only generates a 1-2 small blobs of percipitation, or the thunderstorms are somewhere off the map no-where near my flight plan, it's highly frustrating to go through flight plan to get the right weather which can take 1-3 minutes to load everytime. I think the next Rex should give you choices, for example (you select where you want the weather, how big the weather is, what type of weather it is), , so instead of rex installing a random weather patternyou have full control what you can have. lets just say im flying from an airport you have hazy thundery sky's, as you take off more percipitation builds into dark thunderstorms. From my understanding they are trying to create cloud shadows next 
Performance wise, its not too bad either (runs perfectly fine with the likes of the default fsx aircraft, the Maule is fantastic for low VFR flying btw) but can take a hit with some of the more complicated models. Quite a few images here of a flight in central Oregon in the Carenado Grand Caravan 208B, including a few inside to show the aircraft. 
