I think I heard about this place on EaterLA, and I know there is a review currently topping the BurgerBusters blog. Stopped in today for lunch -- located on the north side of Broadway at 9th. A building to the north where you order, and a marine barracks-type structure to the south on the corner with more seating. I forgot my binders so I did without cheese -- a simple Ponos burger (5oz patty, lettuce, small tomato slice, a couple pickles) for $7+. Took my number stand and sat nearby.
A few minutes later my burger came: ordered medium-rare with a char, it came a bit more than that -- more gray/pink than pink, but still very juicy. Good burger. Drippy -- couldn't lay it back down on the cute square plate. Bun was excellent -- perfect size for the burger and nice flavor. Burger was a bit densely packed (later asked the owner whether the patties were delivered premade. he said yes but they were "in the process of working on that"). Never got the ice-water I ordered, but the burger was good enough and consumed quick enough I didn't miss it.