While I am not a big fan of FSX, I have loaded it into the computer and do run it once in awhile when something of interest comes up. I recently came across a relatively new program that greatly enhances all aspects of FSX. The basic info can be found here:
Even though I have REX, I have not put it to use yet. I have read and re-read the manual so I guess my next step will be to do a configuration of one of the modules to see how it works. I will probably start with the weather. I'm not ready to mess with the airplanes or texture just yet.