Reserve Lane at MCO - highly recommended.
I told a coworker who doesn't travel much and had no Precheck to make a reservation for the MCO Clear Reserve lane and it worked brilliantly. Walked her over to the Reserve lane past the hundreds of people lined up in the regular TSA lanes. The digital signage indicated a 20 minute wait for the regular line. There were about 5 people in the Reserve area waiting to go through. I didn't see the back end but that's better than the TSA Pre lines at MCO!

Note: The Reserve lanes are indicated by a tall green banner separate from the Clear lanes.