Two more lessons : mobile passport cbp phone app as fast as global entry entering USA customs and immigration. and don’t change planes in or fly from Texas.
I used it a few times and found it worthless. You have to pay if you want it to retain your info else enter it all in each time.The last time I used it was a few years ago and I stood in the "special" line where one agent was handling a line of a dozen meanwhile there were a half dozen or so agents handling the regular lines. I watched people walk into the room, progress through the regular line, and pass by an agent while I waited. I was tempted to crawl under the barriers and go get in the regular lines.
The last year has been no wait at all in the main immigration room. There aren't even kiosks anymore in Houston. Both times this year we walked through the queues and straight up to a waiting agent. No lines or stops exiting customs, either. My gf has GE but has went through the regular lines with me last few times and said it was way faster than GE ever was. Other airports may differ, though.