Visulite is one of my favorite venues for live music in the QC! It is a small venue, which really allows for a different type of experience from a larger place like, say, the Fillmore. There isn't a bad place to sit or stand in there, and if there is then I certainly haven't had the misfortune of ending up there yet. There is a full bar right up in the thick of it so you can keep the party going without having to leave the music. And as for the music, this place does a really good job of getting a wide variety of bands rather than focusing on one genre or another. Lots of local acts too, which are great to support.
If you plan on trying to get a seat for a show rather than standing, get there early! There are several high top tables around the place that have great views of the stage but they are obviously first come first serve. When those doors open and the people start flooding in, those tables go fast.