I've had several positive experiences with the concierges. On every IAH-LGW flight I've taken (always in BusinessFirst) the concierge has always offered to make a call to the LGW BusinessFirst arrivals lounge to let them know I was requesting a shower upon arrival. Each time I've arrived at the LGW lounge they knew I was coming. Granted that's not a big deal, but on one flight we were about an hour late landing at LGW, and then the wait for passport control was over 90 minutes. This put me past the normal closing time for the LGW BusinessFirst arrivals lounge. However, because the concierge in Houston had let them know which passengers they should be expecting from CO 4, they stayed open for us. When I arrived at the lounge they explained that it was after their normal closing time, but because the concierge had made reservations for those of us on that flight, they had waited for us.

I've also had a concierge escort the BusinessFirst passengers to passport control at CDG last September. However, I really didn't consider that much of a service. Basically she just led the way, but we would had made it there just fine without that minimal amount of assistance. However, this same concierge was very helpful in providing directions to the RER/TGV station at CDG.