1. That was wholly correct but now the express lane feature has been extended. Basically the ExpressLane text can now be seen on S1/S2 pages (worked only in BML before). [changelog 1/2]
2. Also, it'll display something like <!-- LiveJournal ExpressLane: You received this page before 0 free users! --> even if no time was saved. It's less confusing and lets users know the feature is working, even when no time was saved.
I know these changes are live because I just saw it on an S2 Component-using journal. :-)
Summary: Now something appears when viewing page source on S1, S2, Xcolibur, and Dystopia pages even if it loaded zero times faster than it would for free users.
Suggested new text: Please note that this comment is displayed only on pages that use the S1 or S2 style system, or either the XColibur or Dystopia site schemes (http://www.livejournal.com/manage/siteopts.bml). If you are already at the front of the queue the comment will state you received the page before 0 (zero) free users.