Well, I'll dog pile on here too; AUS, as my home AC is indeed a great club with really fabulous service.
Additionally, I'm not an actual AC member, but rather enter about 70% of the time via Amex Platinum card and the other 30% via status on international flights. But they still treat us fabulously and have done some very proactive, stuff to get us out of jams. However, it probably doesn't hurt that my cute girlfriend manages to always ensure she shows her EXP card at the same time as the Amex...
Regards