Right after I finally convinced my wife to get GE. She complained about the entire process, and then we traveled to SAT two weeks after she received her KTN. When we left SAT, the line for regular security in Terminal A stretched all the way back to the Southwest ticket counter, or almost the entire length of the terminal. We were the only ones in the PreCheck line. Not only did we save a lot of time standing around, I got to say "I told you so"!
I have also been pretty happy to have GE coming back through IAH when the SA flights are arriving.