Unique bar but bartenders/waitstaff are what make this place. Relax and let them know your preferences. Trained mixiologists will prepare the perfect cocktail or go crazy and let the enhance your experience with a few tricks of the trade and vast knowledge of spirits.
As with many other "nice" places we visited, I was appalled at the low level of tipping I witnessed. People, when a server gives you special service, the benefit of their expertise and goes out of their way to be certain you are well taken care of...it should be rewarded..with money. I tip my landscaper and pool boy and they just do a great job; Many servers contributed/enhanced our overall experience and helped us make a memory.