I initially had a CANPASS card, which was the Canadian version of Global entry. During that process, I had some concerns, but the way I looked at it, they were asking for stuff I had to produce when crossing the border anyways, so they already had the info. Granted, they took an iris scan, which I hadn't produced before..

I then "upgraded" to NEXUS, the program run mainly by Canada Customs, but used at US pre-clearance centers in Canada for entry into the US. For that, I had to give the US fingerprints, which I have before for different jobs and such, and they asked me the usual customs questions.

Global Entry was an automatic approval since I was already in NEXUS.

CLEAR requires substantially more information than I usually give an airline when flying domestically. That's a huge difference for me, vs any of the GOES-based pre-clearance programs.