That's what I do, that is only if I am sure my comp won't run out of memory, which causes C2D from lack of memory. The thing about REX is that when weather patterns change at different locations, and if you haven't already loaded ur textures for full route, it will freeze ur FSX for a few secs to update the textures..hit that "VATSIM" button

. I installed a theme I liked and use ASX for weather engine..works really well.
As for textures...it doesn't get any real than this...the clouds definitely give u the feeling of soaring. whenever we have those bright sunny days here in california I look up and think of REX, not the other way around

, they are that good!!