Lives up to the hype.
In my opinion, brisket is the mark of a great barbecue place (at least out here west of the Mississippi), and they've got it down here... the meat is fatty and tender, and it's also got a really nice char.
Given the quality of the meat, the prices are pretty reasonable too... somewhere in the neighborhood of $10-12 per person for lunch.
As others point out, if you go on a busy day, though, you may have to wait... or you may find that something you were hoping to try is sold out.
That said, if it's your first visit, I think you should start with the brisket (which they seem to run out of less often these days, at least on the days I've gone).