Ask Luxist: What's The Best Concierge Service?

We recently received a request regarding a ranking of the many concierge services available. As our reader points out most premium credit card services have paired up with a concierge service and they all promise to get you show tickets and dinner reservations to the hot spots. So who really delivers the goods? New York Magazine gave the nod to Quintessentially in their best of issue but we'd like to know what you think? In specific our reader was curious about LesConcierges but we'd like to hear your raves and your rants about any services you have used.