I've heard mix reviews from friends, so I'm on the fence.
@Wanderlusthrts I think global entry is definitely worth it. We have used it twice in the last year. We got through customs within 10 minutes and know of friends who were in the regular line for an hour.
Emily Helwig I had never heard of CLEAR before, but just by looking at the website I can tell that it's way more expensive than PreCheck, and only allows you to skip the portion of the security line before they check your ID. Then you go right to waiting for a security line. The PreCheck people usually have their own line to check IDs, as well as their own security station. Plus, it's something like $85 for 5 years. So I think I'd go with the TSA PreCheck!