As with the other posters, I've only tried one concierge so far. AKL. It was absolutely fabulous. I cannot express how great they were (especially Andrea!!). The lounge was gorgeous And Sunrise Safari kicked a**! Now they offer a Sunset Safari as well....If you tried AKL Concierge you would be blown away!!
Having said that, I'm thinking of trying either BWI Concierge or YC Concierge in August. Good luck!!