I worked out the aerodynamics for the airplanes in the sim so I
obviously have my opinion.

But to keep my opinion out of the picture, we've posted some videos to
the fsone.com website. All videos are actual footage from FS One. To
highlight the aerodynamics, we've included a lot of aerobatics in the
videos. Aerobatics poses the greatest challenge to modeling vs flying
straight and level where *all* airplanes look alike. 3D flying is the
toughest thing of all. To model the 3D aero correctly means having to
take into account what happens when the flow comes at the airplane from
any direction at any speed.

The videos are here:

http://www.fsone.com/Features/Gallery.aspx

Also, some newer ones are here (unsorted):

http://www.inertiasoft.com/videos/

Besides the "3D aero", modeling spins is ***extremely*** complex.
Here's a video from FS One w/ many airplanes in spins:

http://www.inertiasoft.com/videos/fs...latedSpins.wmv

For comparison, here's the corresponding video of the real airplanes in spins:

http://www.inertiasoft.com/videos/fs1_RealSpins.wmv

So my reply is "you be the judge". That's my two cents.

Thanks for asking!

Michael