I have Nexus, since getting it no more need to take my shoes off or take my laptop/tablet out of my carry-on. You practically get waved through security. Also, at the border in Canada & US, you effectively skip the line and use the Nexus machines allowing you faster entry into the country.

Remember back in the day when the one good thing about the airport security line was not having anyone use it as a stick for the hard sell?

It's also free to US Service members and DoD civilians.

Some travel credit cards will pay for TSA Precheck for you.