This is about the 100th priority tag thread, so it must still be an issue--about whether or not it works.
I've never noticed actually, having had one stuck on my bag for years now. But for the first time on Thursday, my bag was the second one to hit the conveyer belt.
Probably just law of averages. But out of LHR that seemed unusually effficient!
INTO LHR is a different story. It can be first, mid or last. Usually the latter, LOL.