I think it depends on the user. As said, lots of folks have been very happy with FMS. But then a whole bunch have paid big time for RealFlight, too.

I didn't care for FMS at all. Didn't "feel" right to me. I tried RealFlight at my LHS and and it felt a lot better, but I couldn't get past the cost. I went for Clearview. $40 bucks, and now it comes with rc cars (although the cars are very basic at this point).

[link]http://rcflightsim.com/index.html[/link]

In the end it will come down to what you need and expect from a sim.