I’ve been a clear member since it started a few years ago. It has been great! Most airports have a regular line option and pre-check line option. Once you check in through the monitor you are taken to the front of security line, so you can save a significant amount of time at busy airports, or holiday travel.
I live in Seattle and sports stadiums also have clear lines, so we have used it a lot. If you are a Delta or United frequent flier, they offer special pricing. American Express platinum also pays $179 a year as a member benefit if you charge it.
They also store vaccine records, so very easy to connect information to airlines for flights, if going out of the country.