It doesnot run in FSX Missions, practically just for one plane (F-18) as things are right now, too expensive.
If you're going to fly just F-18 and in online multiplayer, yes, it's the way to go...
If you're not a F-18 driver, flying mostly offline (as myself), CS Weapon is the way to go.
I also happen to know that some F-18 online squadrons use also CS Weapon for the ability to have other flying machines weapon capable apart of F-18.

So, what fits everybody depends on what he is up to...