The only down side is the cost of getting a suitable platform to run it on and the hardware to make the whole experience realistic.
I have not used it for a few years so am not aware of any advancements with dealing with the Graphics intensive program.
You need a fast computer and a good set of pedals and yoke.
There are numerous third party addons you can add from scenery, aircraft and weather and sometimes you have to blink to determine how close it is to the route you have flown real world.
For instrument work it is excellent for handflying not so good although passable with some of the addon aircraft.
Pace