I also use UT2 :
http://ut2.flight1.net/
I purchased it late this summer 2013 and have only fooled around with it just long enough to get it installed and learned how to disable the "Daedalus generic repaints"...which I did not like at all!
I have my "Weekly Traffic Density"; [commercial] set at 80% and my "Daily Traffic Density"; [general aviation] set at 50%... seems about the max that I can use at a FlyTampa, FSDT, Taxi 2 Gate, or Flight beam type of airport.
It also has a feature that will allow the default [
not the ones of payware sceneries] jet ways to "attach" to the AI traffic aircraft, which I don't think the other AI programs will do... I could be wrong.
I think the models and repaints are Preview DirectX 10 compliant and they, [the models] do look good.
My version shipped with 2010-2011 traffic time tables, but you can buy updated traffic time tables for about $6.95
Oh, I'm running FSX on an Intel I-7 3960 X @ an O.C. of 4.2, GTX 680 and have almost all sliders and boxes ticked.
...lucky me, for once in the 7 or so years that I've been fooling around with ol' FSX.
...
... default [ not the ones of payware sceneries] jet ways to "attach" to the AI traffic aircraft,...
Oh, I did see a FUBAR one time at my home airport, the FSX default KBHM
