I have been to Wonder Bar quite a few times, and it has become almost a regular spot for me on the weekends. It is my bar of choice for the end of the night, because they have this great coffee drink called a Sicilian Kiss. Perfect nightcap.
I like this bar because it is not usually that busy. I know that sounds crazy to some people, because usually the point is to go to a bar to meet people and hang out with friends. I go to a bar because I want to drink around some people. But, I don't want to wait more than 5 minutes for a drink. Came in here this past Saturday and it was actually so busy that there were no seats at the bar and no bartender acknowledged us for 7 or 8 minutes, so we went elsewhere.
Service is usually very friendly and prompt. When there isn't a band playing, the music is alt-rock hipster music, which I appreciate. I will keep coming here on any night they aren't packed.