UT2 is excellent, and brings KLAX to life for sure. I've been running it for a year now, and wouldn't go back to WOAI, or the others. On my rig, I run UT2 commercial traffic at 100%, and turn off GA, as there are so many GA flights that it impacted my peformance. Without GA, I get all the commercial, and great performance... even at FSDT highly detailed airports. Set it the way you fly, or what works for you.
If you go UT2, there is an option in the interface to turn off "moving jetways for AI planes." Make sure you turn that off, or it will overload the system. All this does is not move the jetways for the AI planes automatically, but it saves a lot of performance in my opinion.
- John