Our bartender showed up early, was prepared, and professional, which is a great deal more than I can say for the past two bartenders I've hired from other companies. I'd hire GYD Party Services again. Although I might suggest in the future the bartender get permission to put a tip jar out, especially at a party at a personal residence. It's generally not appropriate to ask guests to tip the bartender at someone's home. Additionally I'd suggest the bartender come prepared with some drink suggestions, or at least a standard list of questions, e.g. do you like sweet or sour drinks, etc, for those you are undecided.