If the add-on is free, I wouldn't mind checking it out. However, if it costs anything, I doubt I'd take the risk.
As I'm sure many of you know, M$FS/CFS is table based, which is a pretty major strike against it these days. But making matters worse is that changing planes seems to be something of a "black box" (in the physics sense) to the community who does it. M$ keeps a lot of the information that would be helpful, to themselves. This is another strike against it.
However, to give you an idea of where CFS3 stands - when it came out, 1C:Maddox/Ubi Soft was working on the Aces Expansion Pack for their Forgotten Battles sim (a semi-sequel to IL2 Sturmovik). We (FB community) had been informed that we would be getting the Go-229 as part of AEP, but it was some time off yet. Between the wait, and the desire to try out a user-made Vampire for CFS made me get CFS3. The first thing I did was go up in the Go-229 and try to see how much trouble I could get myself into.
I managed to get the wing into a full 720 degree tumble (not just a spin, but a spin in both horizontal and vertical directions) at about 1000 feet...... and
I did not lose altitude!
I couldn't recover it, and stumbled on the warp button and arrived at the next waypoint flying properly again.
That is simply inexcusable in a flight simulation. I realize that out of the box the plane's might have some things not quite right and the community can improve them, but all they are doing is tweaking the paramaters of the plane, not the physics engine, and the physics engine should
never have allowed something like that to happen (I should have dropped like a rock and cratered),
regardless of plane parameters.