Had first GE experience at SFO. Probably saved 15 minutes or so, because non-GE line was pretty short. Answered "Yes" to item about carrying food (candy, spices, truffles), and the receipt did not have an "X" as reported elsewhere, but had a big Circle on the receipt. After talking to CPB officer, we were referred to Agriculture, who X-rayed our bags. They saw the bottles containing the truffles, and despite their own website saying that they are allowed, they wanted to see the bottles. All of this only held us up by 5 minutes.

Because we were connecting to a domestic flight, the "Precheck" logo was NOT on our domestic boarding pass. However, a UA Global Services agent told us that our bar code would have the Precheck embedded in it, and to go the the Precheck line. Sure enough, despite no Precheck logo, the majic beeps got us through the line.

Yes. Global Entry is worth it.